I don't like him but why am I mad he got a girlfriend?

Help me out here. So this guy I was convinced I don't like, or only liked a bit, he got a girlfriend. Now I feel mad but am in denial about it and trying to convince myself I'm not. What's wrong with me? Why am I mad at this when I should be happy if I don't like him that much?

I don't like him but why am I mad he got a girlfriend?
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