Update. We talked and he said he doesn’t know why he lied to me. Said It has never happened before and won’t happen again. Then kept asking if I still loved him, hated him, or gonna break up.
My bf added this girl on snap and snapped her without me knowing. Then waited hours to asked me if he could add her. I said no. Then confessed days later and said that he was scared I would get mad and leave him if he told me he added her before asking.