Either way you look at it, it's pretty wasted. Your first time 'should' be special. Not even from the spiritual level where you 'should' love the person that you're with. But even if you don't Love each other, your first time is going to be where you're going to be most emotionally and physical sensitive. I guess it was kind of good that you didn't tell him you were a virgin because then he didn't have any pretense or decide to 'be careful' with you.
However, you really shouldn't think of him as an ass or anything. You didn't tell him you were a virgin. You didn't ask for a relationship. There are lots of guys who just have sex, and a lot of girls who just have sex. Some people find it easier to cope with life. And you were probably just confused for a mutual sexual encounter. If you really want, I'm sure if you take him aside and talk to him he's probably a lot nicer than you think. Don't confront him. Just talk to him, tell him it was your first time and tell him you don't blame him. He might be nicer than you think.