Hi ninthofdecember,
I'd like to join

wendydarling in welcoming you to the community. I'm glad you finally decided to post. You've found a great place for support and understanding.
I think slow and steady is a good plan. You've been browsing the site, so hopefully you've read up on BPD and the tools you can use to help your relationship (which work wonderfully in ALL relationships). We are constantly updating the site, so I encourage you to explore and read the articles and workshops as you progress in your relationship. This is a great page to explore, if you haven't already:
https://bpdfamily.com/portfolio-4-colsA pwBPD's symptoms usually get triggered by closeness. So your boyfriend is probably aware of that and may be feel a bit nervous as you get closer. Thus, the caution about moving too fast. It's great that he is in therapy and that you've both grown so much. I found therapy for myself helpful, too.
Do you have a good support system around you, too, ninth? It's important to look after yourself, as these kinds of relationships can be intense.
heartandwhole