Guilt

I've been dating this guy for a while. We broke up because he was unfaithful. Six months later I was dating someone else and he severly pressured me into sex. Feeling guilty about it, I break up with my boyfriend and start dating this guy. I've always felt a very magnetic attraction to his younger brother who lives with him. Long story short, his brother and I got drunk and had the most boring, uneventful sex of my life. (I confessed the next day)

I feel like a monster. Thoughts?