<human>: Provide a brief overview of the text.

Met a guy[25/M]  that I [26/m] liked, and he didn't feel the same. Nbd, it's not fun to deal with but it's part of life. Put on your big girl panties and deal with it.

We were friends for a year or so, but after a few rough patches the friendship slowly deteriorated. 
Our friends mingled, so I saw him around and everything, but I never felt comfortable initiating conversations. He always initiated, and whenever there was too much silence or time gone by without contact, he'd send me a message or whatever. 
Towards the end of our friendship, however, he was absolutely desperate to speak to me. I mean he wasn't crazy or anything, but it made me super uncomfortable. 

I kinda want to know what it was like to be in his shoes, but we're not really talking. (I've tried :( he's not a huge fan of serious talks). Why would a guy who has lots of great friends, and is seemingly popular with the ladies react like this?

I'm pretty great, don't get me wrong, but I had nothing to offer him from his point of view. We were never sexual (don't think he had intentions of trying), we weren't best friends, and I just...irked him sometimes. That's what puzzles me the most, I seemed to get on his nerves all the time, and he wasn't interested in me, but he didn't respond the same way when I backed off.
<bot>: guy rejects girl, guy gets annoyed with her friendship, girl backs off and guy tries really hard to talk to her even though she doesn't really have anything to offer. Why?