Hi Bohemianchick, welcome to the forum.
Here on the Staying & Improving board we are all pretty much dedicated to keeping relationships going that may be doomed to various degrees. We are not in the same place as the Undecided board, we have made our decisions to stay for better or worse.
That said, I'm reading between your lines with the mention of cops being called. Domestic Violence is a serious matter, one that many consider to be over the line and beyond the limits of salvageable relationship... .especially if any kids are in danger of witnessing it or worst case getting hurt. Love on your end is not enough to overcome that and you need to accept that and move on.
But supposing that issue is permanently fixed, then you have practical questions that we in Staying are all too familiar with. Some do not have answers, but make more questions.
1.) How do I support him without crossing my boundaries and falling into the “helping him” trap?
Helping/supporting him in what way?
With his issues: you CANNOT fix his personality disorders, you can only not make it worse.
With free food & rent: that's enabling, a big no-no - stop the codependency.
2.) Sometimes I feel like he doesn’t really want me, he just wants me to move on. He did try to break up with me, saying I would be better off with another guy. I really have no idea if I would.
I get this about once a week from my undiagnosed BPD wife. It's standard BPD practice. The Person With Borderline Personality Disorder (pwBPD) fears abandonment so much that a close relationship sets off their alarms and forces them to sabotage the relationship (r/s) to prevent the hurt they fear. Keep in mind none of this is done with logical thinking, it's all emotional responses and they are not aware of it at all.
Read up on ":)on't JADE" - Don't Justify, Attack, Defend, Engage this sort of conversation.
3.) My friends are all scared of him now because of what happened. (I told them after we got back from the trip because we were still mad for a week). How to deal?
If you are going to Stay & Improve you badly need a strong support network of friends and family - because the average pwBPD's emotional support ranges from absolute zero down to toxic and corrosive. You need to keep those friendships going and be a good friend to them in their life burdens too. The wheel of karma crushes those who desert good friends.
4.) My kids don’t like him anymore. My first daughter never did. How do I deal with this?
Back to my initial comment about DV. This man may not be right for your family at all.
I don’t know if ANY of the kids could forgive each other. During the month long road trip, a lot of nasty things were said - “sibling rivalry”. But my kids took a lot of it personally.
That may take some family counseling, and perhaps modify your "permissive parenting" to make some new rules about being respectful to family members or face punishments. I take away videogame time from my 4th grader when he's mean to the toddler.
5.) My parents and my family. How do I deal with this?
See my response to #3 above. When I called a top-secret family meeting and laid out my discovery of my wife's BPD they pledged support and silence which I treasure greatly.
6.) My ex husband is pissed at me “because I put the kids in danger”. How do I resolve?
If he has a valid point... .the mental and physical safety of the kids is not negotiable.
I guess I’m just wondering………... is there really any hope for this relationship? Or is it really doomed, and it really doesn’t matter if he goes to counseling or not?
Doomed it may be.
Counseling is very important, but it is a generic term. Run a search on this board and you'll find a wide range of experience from good (psychologist who treats BPD helping people overcome it and lead normal lives) to bad (unskilled counselor ignorant of BPD making it worse).
I do want to support him, but I am co-dependent and I am working on that. I am reading the book “Codependent No More”, and it is helping a lot.
Aha! Kick that freeloader out.
But I just don’t know if I have the guts to be that strong woman that he needs and I have to explain everything to everyone. I do worry about what people think. I know I shouldn’t, but I do. I just need some words of advice. I do know that we both love each other, but is love enough?
Listen girl he does NOT need "a strong woman", he needs to get the correct therapy to help him learn to manage his out-of-control emotional trainwreck. As I said above,
you cannot fix him.All you can do is to take care of yourself and your children, and read the Lessons
https://bpdfamily.com/message_board/index.php?topic=56206.0and practice the difficult arts of Validation, Don't JADE, SET-UP, DEARMAN, Boundaries, etc.
Good luck Bohemian Girl.