Relationship advice from someone who's boyfriend cheated on her. this advice is to a friend who's boyfriend cheated on her with her sister.
There are other descriptions I'd use for your ex right now and soul mate doesn't come high up on the list. if your boyfriend cheated, Don't ever get back with him. What's happened can never be forgotten. You haven't said if anyone else, like other siblings or your parents knows about this but if and when they do find out. they'll be forced into a position of being a juror.
Either that or they'll choose to deny your experience, simply because it's too hard to stomach the truth of it. What lies ahead will be painful for all of you.
When you're feeling stronger, I would take time to reason why your sister may have done this. Has sibling rivalry always been part of your relationship? Why would she be jealous of you? Although you are the younger sister, as the more mature one. perhaps for the sake of your family, at some point, you will be able to tell her how much she's hurt you. As I said, an infidelity of this kind will be near impossible to forget. But maybe, with understanding, and for your own sanity, you can work towards forgiving her.
Tags: advice, boyfriend, cheated, relationship, whos