Hi Lina
I'm pretty new here so I can't profess to have all the answers as I'm still very much learning to. There is however others on here who will be able to help you much better than me. Here's my 2 pence/cents
depending where you live.
There is lots of reading material to the right of the screen that will help you immensely.
It is important not to validate the invalid but very important to validate his feelings. So when he accuses you of feeling/saying something that you don't regard as true you can use the validation and SET techniques. These should help you with communication when faced with these issues.
As for bringing my BPDbf out of a trigger then I can't answer this and quite honestly I am not sure it is possible. Most BPD behaviours are not personal to you or your words or thinking and to do with their disorder.
The site has helped me immensely with dealing with certain situations and how I am best to deal with them.
Thankfully I no longer walk on eggshells 95% of the time. This has all been down to educating myself as much as possible with BPD and using the tools and techniques to make life with your BPD more of a happier relationship
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