why don't seek things that will put you in trouble later like getting drunk or getting so mad and try to get even ... I don't think that I can trust someone who cheated on me once, I would have always in mind ... If i'm not there ... what might be happening now?

It is not really that easy, talking to someone else it might be ... but getting too close like that as sleeping with him/her in one bed??? I'm sorry but that is really hard ... 

Do not dwell in the past, do not dream of the future, concentrate the mind on the present moment. (Gautama Buddha)