What...are some guys really just this nice?

I have this guy friend who I met about 6 months ago. we have always had a flirtatious friendship, but initally he had a girl friend when I met him. a month later, I started dating a guy myself. when my guy friend was with her, he told me that she was a little jealous of me (she was kind of insecure). he also use to call me around 11 pm on saturday nights to ask me random questions and chat. after they broke up, I was still dating the guy I was with and I wasn’t going to break up with him for my guy friend. about a month and a half ago, I did end up breaking up with my boyfriend. My guy friend has always been a real sweet heart to me. he has always been there for me to talk to, tutor me when I fell behind in class, carried my text books to my car in a snow storm, and stayed with me at a hotel when the roads were too bad to drive home so I wouldn’t be alone and bored. in addition, if I lose a money bet to him, he some how reverses the rules so that I win (even though I don’t have an issue owning up to the bet).
I have never given him signs that I like him as more than a friend because I am not really sure that I do. he has never tried to ask me out or advace our relationship either. my question is: are some guys really just that nice or do you think there is a level of interest there?