I don't know if I should stay with him?

[kat]

My boyfriend had been cheating on me most of our relationship with various online girls. And I recently found out that and I decided to forgive him and give him another change. Then last night he looked through my convos with my ex boyfriend that happened to be like my best friend, so he was giving me shit for saying 'I love you' and such. But my side of the story is that when I say I love you to him I don't mean it in a 'I am to get back together with you' way I mean it in 'you've saved my life so many times thank you ' way. So what should I do? Should I stay with him, leave him? I just don't know!!!