My boyfriend cheated on me with my twin sister and now i'm scared to be with someone else incase he cheats too. will these feelings ever go?

I'd been with this guy for 5 months and I know it's a short time but I caught him in bed with my sister. I felt so hurt and angry and now i daren't be with someone in case they cheat on me. . i feel like i'm not good enough. will these feelings ever go? The things is, he wasn't the only one that has cheated on me, the one before also did. I know it doesn't mean they all will but it's left me feeling worthless and I can't seem to trust anyone any more.
My boyfriend cheated on me with my twin sister and now i'm scared to be with someone else incase he cheats too. will these feelings ever go?
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