Hi Chirimoya!

First of all I am impressed by your insights and how much research and work you've already done. Your post inspired me to read more about DBT. I feel by reading your post that we have a lot in common and I am dealing with the same main issue. I am currently in a r/s with an undiagnosed man with BPD. He is same age as you and Im in my 40's.
I told him that I thought his behaviour was abusive and informed our families what had been going on. Previous to that, he got into rages with me and shouted at me and threatened to leave me about once a week... .I used to be very reactive and to shout back etc.
My thoughts are that two things triggered him: Calling out the abusive behavior and telling the family. I constantly have to remind myself that my pwBPD's feelings and reaction to what I say are amplified to the power of ten or more. I forget about this every week or two and he will retreat into silent treatment. Early in the relationship I was keeping my own family and friends informed about what was going on between us. I thought it was the right thing to do as there was verbal abuse and things got scary a couple times. He didnt like it and in hindsight it caused more problems. But I couldnt know that then. Once I found this site and started learning the tools

(links on the right of the board) things started improving. The verbal abuse completely stopped, resurfaced a little bit recently but soon disappeared again. Nothing scary has happened for a long time. But oh so many silent treatments... .Sigh.
He has gotten into counselling, and has made many positive changes in his life. His rages have become much less frequent and are quite short-lived, so I count that as a huge improvement.
Thats awesome! Congrats on that. I think once a person is in counseling and sees progress they are going to stay open about going back or trying new things so even if not in DBT this is already huge IMO. How are you doing yourself? Are you in therapy or is there something you are doing to take care of your own emotional life and health? Living with a pwPD is challenging and its important that we look after ourselves too as it can too easily get left behind.
However! He has now been withholding sex from me for a WHOLE YEAR This is something that he has done throughout our relationship from time to time but this is by far the longest stretch of such behaviour.
Initially I think he was punishing me and using this as a kind of "silent rage".
He seems to have a lot of intimacy issues and a lower libido than me so I don't know if the whole relationship is sort of less challenging for him if we're not sexual... .
This is an issue in my r/s as well and I agree it is somehow another version of silent treatment. My experience is that silent treatment is less about control (although that can be a factor sometimes) but more about clamming up or feeling unsafe. I cant speak for your husband but I have noticed with my pwBPD that when he wants to have sex there is always some mentioning of us lasting "forever", "never going to leave", most recently "you've really been there for me". I of course feel like I have to jump through hoops or wade through fire to get the affection I want from him. I sometimes feel like there is nothing I can do to make that man come around. I also know that I have done and said things that contribute to his mistrust and fear of abandonment so until Ive completely stopped making things worse (
https://bpdfamily.com/content/ending-conflict) I think my pwBPD's behavior will go on. Unfortunately. I guess what Im saying is our behavioral pattern is reacting to the other.
Is it possible that there is still something going on between you and your husband that he is reacting to in this way?
On top of the obvious problems, I'm a 36-year old woman with fertility issues who would really like to be trying for a baby right now instead of putting up with all this!
I think I know how you feel. In my case its now the opposite, my pwBPD would love to have a child and I feel like things have to get a lot better between us first. But I felt the time pressure in a previous relationship and its common for women in our 30s and early 40s to be preoccupied with thoughts of it. I think the fact that your husband is in counseling and is improving is a positive sign. I come from a family with all kinds of mental issues and I think Im pretty cool

Babies or not is a big question that really no one else can or should try to influence. It is completely between you and your husband.
But before babies you have to get to intimacy. I sometimes joke (mostly to myself never to him) that my pwBPD can smell my thoughts and feelings. Its like he knows things I dont even know myself. Is it possible that your husband is picking up some rushed vibes and that could be contributing to his reluctance?
I'm not quite sure what more to do! We are going on holiday next week and are planning to sleep in the same room for the first time in a long while so fingers crossed that will be a chance to build bridges.
I think thats exactly the best thing you can do, to build emotional bridges. Also things tend to happen when we let go, if you can hope for it but not think too much about it its more likely to happen.
I'm wondering about using the DBT tactic of "extending" or mental aikido: "If your feelings for me are now platonic, then fair enough, but in that case we need to break up and just be good friends".
I would advice against it for the very reason that you said youre not really ready for it.
Then - honestly I tried that and it just backfired. I didnt mean it in a manipulative way, I was being sincere. The result was that we half ass our r/s, it got us in a strange limbo where we were sometimes romantic sometimes just friends but the feelings never changed. It caused frustration and held us back.
It's all pretty trying as our relationship is getting better in so many ways and this is the one big problem.
I think its a symptom of something rather than the cause of a problem. I would try to dig into what is causing him to hold back and then work on that.
I'm worried that as the relationship gets emotionally healthier, he will become less and less interested in sex as he can't handle the intimacy... .
Well there is no way of predicting the future but I personally doubt achieving mental stability would result in losing interest if there was before.
How were things in the past? Were you happy with your sex life before the big shift in the r/s?
I'm struggling a lot right now with feelings of being attracted to another man (who is clearly very interested in me) and I'm not sure how much longer I can keep this up!
I understand feeling confused. Its probably best to remove the temptation for the time being if you possibly can. Giving into that in any way would make everything so much worse and distract you and set you back from your relationship goals.
Please keep us updated. If you have spent some time reading on the board you will see you are not alone, there are other people than you (and me) having this problem. Thats whats so great about this site, we can learn from others. Im really glad you shared this with us, its nice to know we are not alone.