<human>: Summarize the given text in a few sentences.

There's this guy [25M] at work. We both studied in the same University for six years. But only properly met couple of months ago at work. After a couple of weeks of casual small talks in the halls of the hospital he suggested that we should take dancing classes together. I [24F] happily agreed, because he seemed like a really cool guy and I wanted to learn salsa since forever. And then he became really friendly to me, we would chat on Facebook all the time, talk on the phone for hours about nothing and everything, go dancing salsa twice a week. We would spend all our free time together, he would take me out to have coffee, eat dinner, watch movies, bring me small cute gifts to work, do all the things couples do EXCEPT he wouldn't show any interest in getting physical – no kissing, hugging, hand-holding, anything. After about a month of such super friendly behaviour I started to get suspicious of course and checked his Facebook profile, where I learned that he is in a relationship with a girl who is away to study abroad. So this past month we met every day, or at least talked on the phone, and he never ever mentioned having a girlfriend with whom he has been in a relationship for more than 7 years according to Facebook. 

Yesterday, when we were out with some coworkers having a drink one of them asked him straight about his girlfriend, how their wedding plans were going. Surprise again. Apparently they are engaged, but she is away now in USA (we live in Europe), for don't know how long. This made me all confused, why hasn't he mentioned this girlfriend before if he only just wants to be friends with me? I don't know what to think now. What does he want from me? Is this just him being lonely and looking for a friend? Am I over-analyzing everything? Should I just try to kill my feelings for him and stay the friends he apparently wants us to be? I feel like I am being a bit naive and I need some perspective.
<bot>: A guy at work has been putting a huge amount of effort to become super good friends with me; I just found out he's engaged. What do?