I Slept With Someone I Shouldnt Have

He was my lecturer and he is married... but I guess I was just fascinated by him - looks wise and other wise... he's only a few years older then me... it was great when it happened, but then I felt so guilty afterwards... we vowed never to do anything like that again. Now I still visit him at campus because it's near my work and we're really good friends, but once or twice we've slipped up with a kiss and it's so hard to push him away...