Hi ayapama,

It sounds like you have come to the right place to learn some new tools for coping with your ex. For those of us with children with our exBPD partners there are many places to get tripped up while trying to navigate through the post divorce landscape.
How are things with the custody and parenting relationship? How often do you see your daughter? Has your ex found another relationship? How about you?
I think other SOs (BF or GFs) --and your feelings of self-worth-- are the main concern right now when it comes to getting back together ocassionally with your ex.
I think you will find support on the Leaving Board. Also do check out our Legal board. There are invaluable tools and resources here that will help.
Here are a few links to look over:
US: When is good sex a bad thing? [romantic partners]Shared Parenting "Red Flags"/How to choose emotionally healthier partnersWe are here for you.
Yours,
mamachelle