<human>: Condense the text into a few key points

I'd friend-zoned the guy a long time ago, but from what our mutual friends told me, he was still very interested in me.  After things went south with a guy I'd been seeing, this friend was so kind to me that I began to wonder if I should've given him a chance, so I started sending subtle hints that it was okay if he wanted to ask me on a real date.  To my surprise, I saw on Facebook a few days later that he'd entered into a relationship with someone else.  No big deal.  We were casual acquaintances, so he didn't owe it to me to tell me.

The weird part, however, is that he has continued to treat me exactly the same as before he was in a relationship.  Anytime we're at the same place, I am his main focus.  He's a gentleman (and shy), so he's never out of line, but he'll ask lots of questions and take an interest in what's going on in my life in a way that goes beyond what even my close friends do.  I recently had a birthday, and he texted me to say happy birthday (we don't text regularly or anything).  

I thanked him but tried to be short as I didn't want it to be misconstrued by his girlfriend.  He proceeded to keep texting me, provoking more response from me.  He's a good guy, and I really don't think he'd cheat on his girlfriend, but I feel a little weird because it seems he may still have a slight crush on me.  I like the guy as a friend and don't want to be rude to him, but I'm not sure if it's appropriate.  I'm pretty laid back, but I don't think I would have been comfortable with my bf doing the same.
<bot>: A guy who "used to" like me has a girlfriend now, but has been texting me lately.  He has never said anything inappropriate, but it seems strange.