Why is he suddenly distant?

Anonymous
To those who don't feel like reading all this, you can just skip to the last paragraph :)

My Crush, someone I'm trying (in vain) to get over has been acting quite weirdly lately. Let me explain. We were fairly close. We joked around and laughed together, we sat next to each other sometimes in class, he would always say hi first and poke me and stuff. I was naive enough to think he liked me. I never told anyone about it and I never asked him (or any of his friends) whether he felt the same about me.

After a few (8) months, I finally came to realize that he was this flirty with most of the girls. Not because he does it on purpose, but because he has a flirty nature. I was sad of course, but then I thought, "get over it". So I started being a bit distant from him myself because it was so hard to resist his flirting and I didn't want to hurt anymore. After a few weeks, being with him without letting myself flirt with him was becoming easier and we were good friends. I was still crushing on him, but I could at least control myself.

Now a few days ago, he started "ignoring" me. Whenever we look at each other, instead of cracking a joke or flashing me a big smile like before, he looks, smiles quickly and looks elsewhere. Sometimes, he doesn't smile at all. No more pokes, no more jokes. I just don't get it. I don't think he knows I like him (as a said before I never told anyone) and I've been very careful lately not to show him that. So why is he suddenly distant?
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Thanks so much for answering guys :-) your advice is really helpful :-)
Why is he suddenly distant?
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