I know how this story ends bro, and it's not pretty. When I was a freshman in college I cheated on my GF of 4 years. Got really drunk on new years eve while hanging out with a girl I knew from high school. Stayed at her apt. I could go into details because THEY ARE HILARIOUS, but long story short... Cheated.
After that nothing was the same. Stayed with her for 3 more years, but never got the intimacy back. My point is, once it's gone it's gone. The other person picks up on in whether they know it or not. We basically stayed together out of habit, rather than true emotion. Then, finally, we both just realized it was dumb. Best thing that ever happened was us breaking up, and neither of us realized it until after we did it.
I'm seriously going to have to post details of this in the forum... pretty crazy!
How long did it take for you to get over her. She was my first true girlfriend