Whats your reason to cheat? Lets keep aside morality and get down to brass tacks!

I cheated on my partner about a year ago. He doesn't know about it, and I'm hoping that he never finds out. I love him, and I never did it to hurt him. Looking back, I think I did it because I felt lonely. He was really busy at work and it felt like he didn't have time for me anymore, and our sex life had dwindled to almost nothing. A colleague showed me some attention and it made me feel wanted. We only slept together a few times before I put a stop to it...I feel guilty to this day and I know it would destroy him if he ever found out about it. At this point, I think confessing what happened wouldn't benefit anyone, so I'm planning on bringing this to the grave. In short, it was just loneliness. I missed feeling wanted. I regret it - it isn't worth the guilt.