Have you ever cheated on your partner and not felt bad about it?

[curl-6]

The annoying part is that I used to struggle to get women, as I was very insecure. I didn't get my first girlfirend or lose my V-card until I was 23. Now that I have done both, however, I've become far more confident, and now I've got plenty of attractive women showing interest.
The temptation to cheat has come up several times, most recently last night with a hot exchange student from Ecuador.