What is he thinking?

He is an extrovert and I am very introverted. We work in the same section and our desks are nearby. He talks with everyone in the area except me (which is fine). However, during these last few weeks I am noticing that his behaviour is changing. For example he likes to play music but whenever I'm working at my desk, he is now lowering the volume (unlike before). I never complained about the music as I actually liked some of the songs (never told him). We have been working together for around 3 years.

At work, for the past 3 years, he has been complaining about him being single. Few weeks ago, he was talking to an older colleague, a few steps away from my desk, about how he hates being single, and saying that "she's cute but I hate the fact that she's always at her desk working alone instead of joining in" while glancing at me. When I looked at him, confused, he just changed subject and moved away. When he's talking to other colleagues (our age group) he tends to say a lot that he doesn't like quiet people and wants a girl who parties just like him.

Few days ago our boss assigned us to work together but when he saw me he smiled and told me he had to go and another person was assigned. A day later, I was at a work event. I was talking to another colleague (an older one which he doesn't talk to much) and felt that someone was side-eyeing/glancing at me and looked to see who it was. He was there glancing at me (with the colleagues within our age group) while smiling. As soon as I looked at him, he looked away and then looked back again. Then, he smiled and moved away.

I am just curious... why is he acting like this? If he doesn't like me, why does he keeps glancing at me? And if he likes me, why doesn't he talk to me?

What is he thinking?
Post Opinion