Student Exchange Programs

I am currently a college student, and became quite close with a boy in my classes. The relationship was purely coincidental since we just happened to have multiple classes together, but eventually we exchanged numbers and began talking, hanging out and seriously flirting outside of class. He would hold my books, walk me to my car, open doors for me and always greet me with a hug and kiss on the cheek. We had a lot of heart to heart conversations and shared some pretty personal information regarding our families, past relationships, etc. At first I thought we would make great friends but as time went on I found myself seriously interested. After the semester ended for holiday break, we did not speak and I figured it simply fizzled out and was trying to move on, but when the new semester began lo and behold we ran into each other. I was quite surprised but felt it was fate so I told him to call me and decided I would finally make my move. After talking a few times I asked him to a movie when he promptly replied “I don’t think my girl would be too comfortable with me being with another girl alone at a movie. How about lunch or something else during the day?” ARE YOU KIDDING ME?! Apparently they had been together before he and I even met so why in the 6 months+ of our “friendship” had he failed to mention her?! If she wasn’t comfortable with a movie, was she comfortable with all the other times we spent alone together? I don’t think so. We had shared so many other private aspects of our lives that I think a significant other would somehow come up in conversation. If we were truly friends he would have mentioned her, just as if I had a bf I would eventually say it and definitely before 6 mos of hanging out with someone. I would have been fine being just friends, if he had mentioned her early on. In fact if he did, I would have set more boundaries, i.e. carrying my own books and not letting hug me so much and especially never letting him kiss me on the cheek. If he had told me, I wouldn’t have spent all winter break wondering why didn’t call and it would have saved me alot of trouble. I have other platonic relationships with male friends and am even cool/friendly with their girlfriends, but that is because I knew of their girlfriend’s existence! As you can see, I’m pretty upset and have no plans to continue whatever sort of relationship I had with this guy, since he obviously isn’t a true friend. I would confront him, but I’m not that type and don’t want to stir up any more unnecessary drama/emotions with him.(Plus he would probably make something up since he couldn’t even be honest about his relationship status) I’d rather fall of the face of the earth (well, his at least.) I would just like some attempt at closure and would like to know if it was all in my head. I refuse to be a back up plan, whether it be as a girlfriend or platonic friend. Am I delusional? Or he is he an emotional cheater? Thanks again for taking the time to read this and respond. I really appreciate your honesty and effort to help