Why would a guy seem to avoid a girl he liked before?

Rosie1995
A guy at my apartment building used to smile and stare at me a lot and I thought I’d look back when I saw him. Recently though I noticed that it’s completely stopped and he just seems indifferent around me. He talks to anyone but me. But I never did anything rude. I never see him bring a girl at all with him or anything. At the same time overall he doesn’t seem really happy. Maybe he’s not dating someone seriously? We used to make eye contact and smile at each other. Out of nowhere it stopped. Only sign I have that he’s interested is a month ago he told me I have really pretty eyes. Other than that he’s giving me the cold shoulder. A few days ago I smiled at him as he was heading in another direction and he saw but walked right past. Sometimes I sensed that he wanted to talk to me since he’d kind of stop right in front of me but not entirely look at me at all. He looks like he’s about 10 years older than me and I’m only 25. Guys, I don't know I’m stupid with reading men 😂
Why would a guy seem to avoid a girl he liked before?
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