Should I tell him why I'm distancing myself from him?

Anonymous
Me and this guy were talking for 2 months. We were getting close and then Christmas break happened.

I didn't get to see him over break because we're in college. He posted a Facebook status that mentioned he had "someone" and it was about me. A few days later he stopped calling me pet names in texts. I saw that his ex tagged him with her and some friends twice. A week later, she posted a picture of the 2 of them. Then, one of his ex's friends wrote on his wall "I love seeing you and (ex) getting along" He'd mentioned they were still friends, so I tried not to read too much into it.

When we got back from break he told me about her and that he thinks she feels guilty for cheating on him and causing their breakup(8 months ago), but he was still really hurt.

He continued to flirt with me and acted like he did before Christmas so I figured we were ok.

He told me we were just friends a week later and said he and the ex were back together. I yelled at him about leading me on. I figured he'd fess up to the real reason he stopped treating me like we were pretty much a couple. Instead he told me he liked me, but he sometimes wondered about how I felt. That's bullsh*t! He knew for a fact I liked him. We even registered for class together to spend more time together 2nd semester.

This is what I know happened. He had no intentions of getting back with the ex before Christmas. That's why he posted that status saying he had "someone" (me). I believe the ex saw it (she didn't "like" it) and it pissed her off that he was moving on. I think she and her friend started hanging out with him to get him to think twice about me.

I know that's what happened, but he won't say it. He's acting like all this time we've just been friends, but I have about 1,000 texts that differ.

He told me he feels really bad about leading me on. Since we registered for class together and now have so many classes together we see each other all the time. He's being really nice to me. He still waits for me after every class, acts like a gentleman, etc.

He still flirts with me. He complimented me. He asked me to go to dinner with him and this couple he knows. He asked me to go on a road trip with him and some friends for Spring break. I told him I thought I might be too busy to go to either.

I usually go to his house after school, but I've been making up excuses since he got back with the ex because I'm still really hurt by what he did.

I'm trying to distance myself from him because I'm still mad at him for going back to his ex when we were already getting together and then lying about it.

Anyway, I think he's starting to see that I'm distancing myself from him. And I'm afraid he's going to ask me why. If he asks me why, should I tell him it's because I know what really happened between him and the ex over Christmas? I really want him to know that I know, but I don't want to start another argument about it because we have to see each other so much. So, what should I tell him?
Updates
+1 y
I know it sounds like having "someone" was about her, but I think it was about me. I think that's why she didn't "like" the status. I don't think he would have posted it if it was about another girl because he knows I would see it. I saw him 2 days before he posted it and things were still good between us. We texted the day before he posted it and he was still calling me pet names. He stopped 2 days after the status. That's why I think his stupid ex saw it and talked to him.
Should I tell him why I'm distancing myself from him?
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