First Impressions Lasts..

I know it will heal but the scars is there... it is a lesson men should bear in mind, not breaking a trust....

Despite the myriad of social stereotypes claiming that men cheat because it is in their nature to do so (see the psychology of the male-hunter and the associated genetic heritage, bla, bla, bla) actually, when a man cheats on a woman he really loves (and not only claim that) there is something wrong with that particular relationship. Obviously, this doesn't mean that when a man cheats, there is a rhapsody of emotions. No. That would be utopian. Yet there is something that triggers his actions. Either he is no longer attracted to his girfriend/woman (and this won't change in a positive way in the future), either he is not yet mature enough and uses his woman just a bad-weather shelter (where he can return anytime; a man feels when this can happen), either his partner's sexuality is not offering him what exactly he is looking for, either he needs a confirmation of his manhood in the arms of another woman, etc etc etc. As a man, I had many (too many) relationships/adventures/etc. After several hundred of these situations I can claim that no man will remain with a woman he cheated unless his reasons are deep. Cheating breaks an important bond between the two and sooner or later will trigger indisoluble problems. Unless you master selective amnesy.

Was your first impression of your bf the first time you met was he's not a cheater? If so then it didn't last, did it? I don't think first impressions last. In your case, it's all about trust issues. You two have to work it out for your relationship to work. I suggest you forget about what happened to live your relationship anew.