Why is he being like this?

Since around September a guy has been acting a certain way with me. Over the months he has stared at me a lot, he has honestly stared at me soooo many times. Sometimes he looks at me and looks away and bites his lip, and watches when I'm with guy friends. We both get on well and we haven't had any issues.

Recently, he's been completely ignoring me. When he sees me, he'll just look at me for half a second and look away. I walked into a room today, he looked at me, just turned around completely, and was turned around until I left. I don't understand why he's being like this all of a sudden, he's just not acknowledging my existence all of a sudden and I don't get why. Do you think he has something against me?
Why is he being like this?
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