I find it amusing that partners think their partners will stay faithful no matter what. I hear so many stories of cheating and unfaithfulness and the old "I don't understand why they cheated?" Maybe it's because they're bored? You turn them off with your appearance or attitude? Maybe and probably most importantly you neglect them, we humans love attention and if it's not offered we will find it somewhere else. Honestly if a really cute girl flirted with me I would flirt back, if they suggested things I wouldn't say no. Right now I'm in a boring relationship nothing exciting happens and recently I've been flirted too by a number of girls and all have this attitude of sluttyness and that where I cave each time. I can't resist a girl who caters to my ego and makes me feel amazing and when they add dirty suggestions like masturbating and oral pleasures I'm done!
I'd love to be in an open relationship I'd have no problems with it, some say you have to careful and blah blah blah, but it doesn't phase me as long as I get to hear the sordid story I'm a happy man.