Is it a normal coworker behavior or there's something else?

I joined my office on June. Now since it's a research space it's a very fun department with mostly young people. Therefore colleagues make friends groups and everything. I met this coworker of mine here, he's around 4 years older than me and seems pretty matured. He has a good reputation in the office, particularly among women for being a very gentle and trustworthy man. I mean most women like and respect him probably more than any other man. He has worked here for a year and few months. Now, the thing is ever since we got acquainted he talked to me a lot. I found it normal because we were from the same state and he does talk to people. But soon the talks started getting longer, he was very eager to tell me and when I didn't go to work for two days he texted me to check on me although we weren't in each other's contacts. After that it got more prominent, he even these days calls me for work stuff and starts working going silent as if my presence is all that mattered. And he's not doing anything like this with any other woman.

I don't dislike him or anything, nor am I feeling disturbed. I just want to know what's up. And please don't ask me to ask him, I can't.

Is it a normal coworker behavior or there's something else?
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