Should i forgive him and move on?

a few weeks ago, i found out that my bf made out with another girl twice in one night. the thing is, he lied to me about that night before i even suspected anything, and then i found out what actually happened. i confronted him about it and he lied to me about it all night. the only time he apologized was when the trut was actually truly revealed to me. idk if i should stay with him and forgive him or if i should dump him for good?