Why does he care so much? What is he thinking? (Wise advice please)

So me and this guy, Jordan became friends through college and we both started liking each other. He thinks I'm gorgeous, wise, so caring toward other people, and just an amazing person. When it came around to "the talk" he said he still wasn't over his ex who blew him off a while ago and is currently playing games with him and still thinks about her a lot, so he's not really for a relationship. I kissed him "goodbye" and it turned into a long kissing and hugging "goodbye" and he was really upset that I didn't want to talk to him anymore because I didn't think it was smart to be friends since he had a different girl on his mind. I heard from a friend of his that he almost cried when I left. I also heard that ever since that day, (a week ago) its been really bugging him a lot. To make matters worse, I got back with my ex the day after. (Idk what I was thinking) but one of his friends saw me holding hands with my ex at the mall and it got back to Jordan. I hear he knows and said this, "My friend said he saw her holding hands with this guy at the mall, what does that mean?" Now I don't speak BOY but what does he mean when he asks, "What does that mean?" I told my friend to tell him I was sorry, and he appreciated it becasue it has been bugging him. Right now, we aren't talking. I don't understand, he's in love with this other girl, why is this bugging him so much?

P.S. I'm not with my ex anymore. That was just a rebound. But he doesn't know that. Why does he care so much? what is he thinking? What should I do from here?

Why does he care so much? What is he thinking? (Wise advice please)
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