I found out my boyfriend knew his best friend was cheating on my sister for months
My sister was dating my boyfriend’s best friend for almost 2 years. About 3 weeks ago she found out he had been sleeping with a coworker and ended things with him. She was completely crushed.
Last night my boyfriend admitted that his best friend had told him about the affair months ago, so he knew his best friend was cheating on my sister the entire time.
He said it wasn't his place to get involved and that he didn't want to betray his friend.
What bothers me is he was around my sister constantly during those months. Dinners, birthdays, even sitting there while she talked about how serious she was about his best friend. He never told her or even mentioned it to me.
We've been together almost 3 years and were talking about moving in together soon. I have some money saved so there’s no pressure to rush that, but now I'm seriously questioning what this says about him as a person.
He keeps saying he wasn't the one who cheated and that I'm blaming him for something his friend did.
Would you end a relationship over this?