Why do I have this feeling that I want to message him so bad?

Hey everyone, so to make this short.. I just want to ask a great advice from y'all because I badly want to message this guy who had a crush on me a long time ago. To clear things out, I'm not expecting him to have the same feelings for me but I'm just really curious about him now I don't know but I just want to talk to him, I'm literally so clueless.. well maybe it's just because I haven't seen him in ages.. and i just got to appreciate him more now than before or whatever.. but actually the funny thing is I really don't know the reason why I want to message him, it's very confusing and I don't know how to feel anymore so please, help me with this one, i badly need to clear my mind haha
Why do I have this feeling that I want to message him so bad?
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