Just out of curiosity, you say you love her/him. You kiss them, you hold them, you show them you love them, physically and emotionally. So why do people cheat for?
Most Helpful Girl
Because they are weak, horrible people who have to sleep with as many guys/girls as they can to make them selves feel better.
Personally I also think some people do it knowing and hopping they will get caught. That way they won't have to be the one who ended the relationship. I think they do this because they realized you were the type of person they could have a real serious relationship with one that involves marriage and kids, and they got scared. So they found the cowards way out.
If this has happened to you I am truly sorry it has happened to me all I can say is if they ask to get back together DON"T do it.1