I just don't know what to do.

I broke up with exwBPD last week. But I still don't feel free from her. It feels like any second she could come into my life and then it would just continue as we were before christmas.

Everytime I make a mistake, no matter how mundane or small my body and mind goes into overdrive anticipating all kinds of horrible events or just her barging through the door yelling and screaming and wrecking stuff.

I tried talking about this with my stepmother and she just burst out laughing, she literally couldn't stop laughing and I felt so incredibly stupid. I mean I already know she has issues, she is deeply codependent with my dad and have rather strong narcissistic tendencies. So maybe me trying to open up to her was the problem.

OR maybe I just am too sensitive.

Like if that's the reaction from others then maybe I've just become too sensitive and need to man up?