Why would a guy behave this way? please help?

Anonymous
So my crush found out I like him and I've seen a change in his behaviour. Before he was very neutral but now he stares from afar and doesn't break eye contact even though were both looking at each other. However when he's up close he doesn't look at all its like I don't even exist?

During shift he watched me leave the building and also left at the same time and he was observing me the whole time I was on my break. I don't get why he would spend so long observing? But when we were back on shift he acted as if I wasn't really there. He came and stood like a meter away but didn't say anything on shift and I asked him if he's okay to break the silence (I was actually quite frustrated) like if he isn't going to speak why stand there and make it awkward? I had to initiate conversation and he was nice and made convo but I just found it strange. He also stuck up for me when something happened that day but it was done indirectly as he asked someone else what happened.

It's like he wants to be so subtle but he's obvious at the same time?

I feel so frustrated because I can't tell why he'd behave this way?
Why would a guy behave this way? please help?
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