Why would this guy talk to me the next time he saw me when we agreed to stop talking?

Anonymous
I really like him he’s my coworker and I’ve known him over two years. He has a girlfriend and Though I’ve liked him there’s never been anything there since I knew he was taken. Recently he’s been flirty and seeming like he has an interest. I’ve loved the attention from him but I know it’s wrong with him having a girlfriend. I figured it was best to go ahead and end us talking at all. I struggled to tell him but I finally said we should stop
Talking since he had a girlfriend. He said it’s probably for the best with the feelings I have. That was it and when I saw him later he didn’t look at me or anything. I assumed that was the end unless we had to talk. I was on vacavtuon for a few days and when I saw him again he immediately talked to me. He made s joke about something and cause I like him I did talk to him a little but it was jjst small talk. I asked why he’s talking to me and he just kinda brushed over. I don’t know why he’s acting like nothing happened or what I should do.
Why would this guy talk to me the next time he saw me when we agreed to stop talking?
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