I helped a guy cheat on his girlfriend, now I feel guilty. Should I apologize?

I ran into a semi-guy friend who I've always had a little crush on but we don't know each other that well. So, we were at the bars and I was drinking, and I saw him there and we started dancing, before I knew it we were back in his bedroom. We didn't have sex but definitely hooked up. So, the next night I texted him, and we did that again. He broke up with his girlfriend of 2 1/2 years the next day. They were really in love... Since then, we haven't talked much, I have made efforts to see him on weekends but he's either gone or not answering his phone (not good). His facebook statuses are lyrics to songs about breakups...so basically I am feeling a little guilty for helping him cheat. I kinda like him though. Should I apologize to him? Or just ignore him. I really don't want to ignore him though because I am still attracted to him. I'm not sure what I should do, or if apologizing would make things even more awkward. What do I do?
I helped a guy cheat on his girlfriend, now I feel guilty. Should I apologize?
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