How to fix a damaged relationship?

I gave my boyfriend permission to open the relationship because I thought I’d like it, We opened the relationship for 9 months and it turned out I really wasn’t ok with it and now I’m traumatized by it all. He’s also said other hurtful things like he had the best sex of his life with this other person. (We’ve been together for 9 years 😒) how can I rewire my brain to stop hating him, being disgusted by him, not wanting to be touched anymore by him etc? I’m desperate to be comfortable around him again, but his presence makes me get sick and vomit 😢

he loves me very much and is extremely stressed by this situation, because I start to convulse and shake if he touches me

How to fix a damaged relationship?
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