Throwaway for obvious reasons. I cheated on my partner of 3 years. It was a dick move, and I live with the guilt, as well as the fear that if she were to ever find out it would crush her. I've never tried to justify my reasons. It was a bastard act. I never saw myself as the cheating type, I don't think anyone does. Up to that point I'd always been monogamous. My relationship with my partner has been fine, a few rough patches here and there, but the moment we moved into together her sex drive went into rapid decline. We discussed it openly like adults, we tried numerous times to reinvigorate it, she even went to a therapist, but eventually we got to the point that the only physical intimacy we enjoyed was a quick kiss on the lips and maybe a cuddle on the sofa. I ran the full gamut of emotions; anger, confusion, sadness etc., but eventually I just learned to accept it. To be honest, I felt defeated. I tried to break it off with her (for reasons more than just sex), but she convinced me to stay and work on it. Three months later, I was just going through the motions; we were in the midst of moving house and her parents were visiting from Europe. I met someone, lied about my relationship status, and had a month-long affair. I was surprised how easily it happened, how easily my will was broken. In the heat of the moment it felt great to be desired again. I pushed the guilt aside and indulged it. It's been a few weeks now since it happened, and my relationship has just carried on as per normal. Sometimes I think I'll tell her, sometimes I think I'll break it off for good, but for now I just continue on like it never happened. I'm not a bad person but I did a terrible thing to someone I care about, and I'll have to live with that.