toxic femily

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⁉️Im having a really hard time dealing with my boyfriends toxic family. Here’s a little summary. When my boyfriend chad was 11-12 his sister that is 2 years older than him molested him. She didn’t hold him down but she done it mentally. She done this until he was 16-17. He is 19 now. We have been together for officially 3 years. He has a past of cheating and sexual problems. It made him attracted to his sisters until he got the chance to get away from them and realize what was going on. His sister has no respect for him or anyone else (family/friends) and definitely not our relationship. He is now starting to realize everything that happened and asks himself “how did I let that happen?” or “how did i not see it?” but anyway fast forward to 2019 in october his sister tried to fight me and since then chad has not had a single conversation with his sister. No action was ever taken with the sexual assault, he still remained close to his sister. but now that he hasn’t talked to his sister his mother is blaming me! saying things like “your sister has always been nice to you, what have we ever done to you?” and just stuff like that. his mom is trying to force him to have a relationship with the most toxic person i’ve ever known. he currently is in a really good place but he doesn’t know how to deal with his family.. and personally i don’t think i can handle his family anymore. i don’t know what his hopes are for the future relationship with his sister, i just hope he plans to keep his distance. i’ve spent these past 2 years being PARANOID about what they talk about through text, how they act when they’re alone etc and i’m just tired of it. i trust my boyfriend and he would never be disloyal to me in any way and he has proven that to me but i just can’t stand the thought of them trying to rekindle their relationship. he’s stayed away from his family for about 2 months now and i have never felt better.. our relationship has never been better. I feel like the biggest weight has been lifted off of my chest. He has a job and we’re just overall doing so amazing. I just know that i can’t handle his relationship with his sister anymore.. he’s saying he wants to keep his distance from her because of how awful she is to him.. i just hope that’s true and that is what happens. for the sake of my sanity and mentality i really just can’t deal with his family anymore