Do you think it was weird that I cried?

[KHAAAAN!]

Once a cheater, always a cheater. This isn't a cold hard fact, but it IS a general rule. Cheating is a good indicator of how a person deals with relationship problems and not getting their needs met. Instead of talking about it, working it out, or walking away from a sinking ship, he flirts with other girls or he cheats. Cheating is symptomatic of emotional immaturity, and it's highly unlikely he'll ever change.

Your choices are to give him another chance and completely let go of the past, which is understandably difficult and would probably best be done through couples counseling, or to break it off because the trust is gone. Personally, I'd opt for the latter, because the kind of selfish, self serving attitude that makes a a cheater a cheater (generally) is a character flaw that, unless they recognize, acknowledge, and genuinely seek professional help, isn't going to change.