Tip - Dear Mariella: I slept with a co-worker who has a girlfriend. Now I don't know what to think…

I like this guy at work. A co-worker told me it was one-sided and to give my affection to him instead. Then he turned up at my house and we had sex. I don't want to hurt his girlfriend, but my heart is saying yes. He told me it was a one-time thing, but we were kissing and cuddling for ages. I don't know what to think.
Tags: Relationships,Life and style