My trauma is hurting my relationship with my current partner. What can I do?

Anonymous
As stated in the title my trauma from my past relationship is hurting my current one. I've been greatly paranoid of what would have previously been common uninteresting things my SO is doing.

In my last relationship I was stuck in a mentally and physically abusive situation, she'd constantly belittle me and go behind my back talking and flirting with other guys. I grew to expect and hurt from everything she was doing while trying my hardest to appease her. She eventually left which also devastated me at the time but I've grown the accept that that was the right and only thing that had to happen between us. The only problem is my brain is now wired to expect pain and unfaithfulness.

Recently my SO (who is bi) has been hanging out and talking to her lesbian housemate who lives with her, her sister and her mother. They've shared their traumas with eachother in what seems like a short amount of time compared to when she shared them with me. I know in my head and she's assured me multiple times that she has no feelings for her but my mind can't stop jumping to the worst possible conclusions. I feel like such a peice of crap cause I trust her, she hasn't lied to me except for jokingly when the truth is always apparent, but my mind keeps hurting me. I don't know what to do cause it hurts her too and I can't seem to stop it. Any advice would be helpful.
My trauma is hurting my relationship with my current partner. What can I do?
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