My crush rejected me but is now upset I’m not giving him the same attention anymore. Why?

I have a huge crush on my coworker. We had a very flirtatious relationship and we were closer with each other at work than with anyone else. Other people were certain he liked me back too and he was just nervous to say something. Any chance he would he would find a way to be close to me. I decided to shoot my shot and tell him how i felt because I couldn’t take not knowing anymore. He basically responded with “thanks for bringing this to my attention. I didn’t want to assume how you felt so I didn’t say anything cause I didn’t wanna make things awkward”. Okay, fine. I’m glad I got my answer that he never liked me back but I felt very hurt cause he definitely led me on. I asked if we could keep conversations at work to be work related and I also told him I wanted to remove him from social media because it was hard seeing him so much outside of work on there and he said that was fine. He didn’t seem to care at all, didn’t say he wanted to keep the friendship, didn’t apologize if I felt like he led me on. For the first few days it was fine. But now he’s getting extremely upset that I’m not giving him the same attention anymore. If I give him even the smallest bit of attention his mood noticeably changes for the better. But when I enforce those boundaries and keep things short and work related, he gets upset. I didn’t wanna make work awkward but I don’t understand why he’s so upset if he never liked me to begin with.

My crush rejected me but is now upset I’m not giving him the same attention anymore. Why?
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