How to make someone feel bad for leading me on?

Anonymous
OK so a guy a few months back told everyone he wanted o ask me out but I didn't believe anyone about that. Then over the summer we lost touch and now that I'm back in school ( junior) he started flirting with me and talking to me and I thought that he might ask me out. Then I found out that e recently got a girlfriend over the summer. He still acts the same and were still friends but its eating at me.I'm not heartbroken or upset but I'm really angry. So how do I make him him feel bad for not saying anything when he liked me, then leading me on, and not telling a good friend he had a girlfriend?( Please don't tell me not to make him feel bad or any be a good person hodo. I just need answers. And if you tell me not to I'll do it anyways so please help)
How to make someone feel bad for leading me on?
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