Hi Meh1$,

I'd like to join

Warcleods and welcome you. I'm so sorry that you're going through this. A break-up with someone that displays BPD traits is incredible painful. I can relate with feeling betrayed, it's tough watching your ex happy when you're knee deep in pain and they have checked out on you and the kids.
How do I manage my anger and hurt
It helps to share that anger and hurt with others that can relate with it. You're not alone.