Does this make me a bad guy?

in my past relations, i have cheated on my gf's. But in general, i feel like when i cheat it makes me feel somewhat more manly. i mean, i tend not to feel guilty, rather i feel more empowered. i know its not a good thing, but i just cant seem to stop. i get a thrill out of cheating even though i am a decent guy on the inside. i honestly find it hard to stop..