Talking to an ex after a breakup?

Anonymous
Well, my ex broke up with me almost 3 weeks ago, and I'm still having a really rough time. He was my first actually "official" boyfriend, but we were only officially dating for a month, and I left for about a week, and he broke up with me the day I got back.

He originally started talking to me more 2 weeks after he and his ex broke up because he was depressed due to breaking up with her. So he basically used me, to help with his feelings for her.. but then we started to date 2 months later..

He's had multiple girlfriends, all of which haven't lasted more than a few months

The reason he gave me for breaking up with me was because he thought our personalities weren't compatible, but I don't know if I necessarily believe that, because we've known each other for over a year, and we were fairly good friends, and he's still really good friends with that ex, and now they're basically all over each other again.. and it kills me.. he doesn't really seem to give a crap about what he did.. He said he likes me as a friend and still wants to be friends, of course.. but I think he might just be trying to justify what he did.. and he hasn't spoken to me since. His ex still doesn't know we dated because he wanted to keep it a secret to avoid hurting her more, which I stupidly agreed to

So I'm thinking of telling him that we can't be friends anymore.. It will kill me, because I still do want to be friends, but he's killing me by ignoring me/getting closer to his ex anyway, but I also want to ask him some questions about why we broke up, and basically tell him what I would've done different. I know everyone says this is typically a stupid idea and to just move on, but I feel like he at least owes me this... Hopefully to help me move on, and to help my future relationships, maybe to change his perspective on dating/hurting girls, because he desperately needs it.. and so I learn not to make these same mistakes...

Thoughts?
Updates
+1 y
Hey guys, I was pretty aware that I was a rebound, even before we started dating.. He did basically tell me, in a different way... but I figured we might have been OK since we waited a bit, but yea, it's not. I want to hear the truth from his mouth so he stops trying to hide from what he did and make it seem like it's ok.. He does this rebound crap all the time, so it's not all that surprising.. I know this isn't my fault, I just think he should care, because we were friends before.. regardless
Talking to an ex after a breakup?
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