Hook-up gone terribly wrong

So, I had this friend, we'll call him Bobby. Since meeting at a party last march, we've been very good friends. We text each other back and forth very often, always interested in what the other is doing, and sharing common interests in music, school, etc. We have several mutual friends, and we will often see each other out at parties or bars. I've always found him very physically attractive, but we've never kissed, gone on a date, or done anything that friends wouldn't have. About a month ago, my date to my parents formal cancelled on me, so I brought him, and we had a great time. He seemed to genuinely enjoy meeting my family and friends. However, I've always had the feeling that he may want to hook up with me, because I would occasionally receive those tell-tail late night "hey, what are you up to, you should come by" texts, but in the morning (after I didn't come), he would always either not address it or attribute it to being a little too drunk. However, this past Friday, we met up at a late night-pizza place with another friend after going out. His apartment is closest to where we were. The other friend left, and we were alone. We had both been drinking a bit, but weren't particularly intoxicated at all. We were just sitting on the bed, watching TV and listening to music, but before long, one thing led to another....we went from never kissing before to just having had sex. Immediately afterward, however, he began FREAKING OUT, which was highly unexpected. He told me that his family was very religious, and would have been highly disappointed in his actions. He then kept questioning my sexual history and whether or not I had used condoms with these people, before confiding that he had been a virgin, which he later tried to deny. I must not have provided the most tactful responses, which included "OMG are you serious, wait haven't you had a girlfriend before?" He tried to tell me that I should leave, since he had to be up early the next morning, but when I pointed out that it was 4am, he allowed me to stay over only after he found a spot on the bed as far away as possible from me. Before I left the next morning, he gave me an awkward hug, and without eye contact, invited me to a party that they were having the next day. I thought all was fine. I went to the party the next day, gave him a big hug, but didn't really have a conversation. The next day, however, he proceeded to BLOCK MY NUMBER AND BLOCK ME ON FACEBOOK. I've been thinking about this night and day, having cried over it several times, and honestly can't focus on much else. I know that I really have no reason to apologize, and that i should just let it go, but I do not want to lose a friendship with someone I was close with, and I also do not want things to be awkward when we encounter each other with our mutual friends. Since he's made it clear that he wants me completely out of his life, how to I get him to at least hear me out? Or at least, to know precisely WHY he now hates me? For reference, I'm 20 years old and a 3rd year student in college

It is difficult sometimes when an encounter like this happens between good friends. That being said, when you are good friends it SHOULD not be difficult to communicate and talk this out. He is probably embarrassed and ashamed that he broke a vow however, he also sent mixed messages to you. Give him space and allow a mutual friend (without knowing the story) act as a go between so you can meet and talk it out. It will be fine ultimately and chalk it up to one wild night that all are entitled to at your age. Good Luck!