Where you forced to leave someone?

So I'm not fully going into detail but
I liked no...love this guy and he loved me too. We spent 7 months together and during those months we made promises, helped each other and just being lovey dovey.

Recently something happened to us and we hurted each other. I want to stay with him but he's saying that I should leave him. Then he told me he had feelings for one of our friends and rn this whole thing turned into a mess. Should I give them the chance to date each and to move on even though it would hurt me or should I be selfish for once in my life and keep him?