To Love or To Lust

If love is so powerful and so real. Then why is it that wives cheat on their husbands, and husbands cheat on their wives? If love were so true to the extent that romantics make it out to be; then love would keep spouses from having affairs and as we all know in most cases it doesn't. Also I know when I'm in love and when I'm in lust, but have you ever wanted someone so badly that you just have to have them no matter what the consequences. If you find yourself having fantasies about that woman at work or that guy at the gym more often than not; chances are you've fallen into lust. And could you truly say ,that if the opportunity arose for you to have that person, that you wouldn't hop right into the sack with them. I know love is powerful, but lust is powerful too; I would really appreciate another opinion on the matter. Since my girlfriend has cheated before and so have I, but we still feel like we're in love. I also think she did it to get back at me for doing it to her but I'm sure she enjoyed herself. What a bitch... I get made when I think about it because its a guy she works with and she is still working with, but she says she's not interested in him and never really was. Because he doesn't vote, and he doesn't like dogs, and blah blah blah, but she screwed him. That just doesn't make sense to me, or maybe I'm just jealouse.