A guy at work keeps staring at me, he will talk to me, but then other times act like I don’t exist. Does this mean he doesn’t want to be friends?

Anonymous
So I just moved departments at work and I was in a meeting and there was this guy there and at the end of the meeting I caught him looking at me and we made eye contact. I’m not really used to that so I kind of hurried off right after the meeting. Then I kept seeing him all over the place at work and I kept catching him looking at me and we kept making eye contact but neither of us would say anything. I finally got the courage to just say hi. So when I ran into him again we both smiled and he said hi first. Then we started talking about work and he was asking surface level personal questions. It was nice and I thought I made a friend. Now he always says hi and bye to me. He’s also super busy with work. So anyway, lately he has been more standoffish but still says hi and bye and I still catch him looking at me. But I was with a coworker and he walked by, said hi to them, then ignored me. Later in the day I saw him talking to another coworker friend of mine who I don’t ever see him talk to. Then we had a meeting again and the moment I walked in the room he stared at me and watched me until I sat down.

Obviously I am super confused on what is going on. Is it possible I did something to offend him and I just don’t realize? I was kind of hoping to be friends at least or maintain a good work relationship.

Any ideas as to what might be going on?
A guy at work keeps staring at me, he will talk to me, but then other times act like I don’t exist. Does this mean he doesn’t want to be friends?
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