Why does he keep leaving and coming back?

I had a crush on this coworker and we texted for a little. He liked me back but after a day or two he stopped feeling it. He didn’t tell me he wasn’t feeling it anymore he just stopped texting me and told another coworker about it. Then one day he sees me at work then I get a text about asking about my day. We texted until the afternoon but that was it. we no longer talked anymore. He would see me at work everyday and not say a thing for weeks. I let it go and had no choice but to move on.
Two months later, he’s been trying to get my attention again and bringing me up to another coworker. We don’t text but he’s always doing stuff at work to get my attention. I’m not sure what he’s saying but I did get a hint that he was talking about me to a specific coworker. I think he’s showing off to this coworker that I like him.

Why does he keep leaving and coming back?
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