Most Helpful Guy
Your boyfriend clearly doesn't care about hurting you. This girl though is a fool if she thinks that he won't cheat on her as well. I advise you to dump him, try to seek emotional support from your girlfriends, perhaps they can help you through this tough time.
Most Helpful Girl
Listen carefully: Never EVER EEEEVVVVEEEERRRR take back a cheating boyfriend! If he cheated on you once, he WILL cheat on you again! When someone cheats, they are utterly disrespecting you. If someone doesn't respect you or care about your feelings enough to stay faithful and not lie to you, they obviously don't give three shits about you, to put it bluntly. And once you forgive a cheater, they will just think that you will keep on forgiving them, and they will do it again. Trust me, I know. Don't ever forgive a cheater. That's just a lot of extra baggage that you don't need to be carrying around. Go find yourself a real man that won't need to lie to you and cheat on you. You deserve SO much better and I know you're going to find someone who treats you the way you deserve to be treated.