Welcome to the forum medicalqueen.
Me and my friends have a really simple saying we use to determine the proper course of action in everything in life. It consists of two words: "Act accordingly."
The problem here seems to stem from the fact that you wanted this guy to be your boyfriend, but you gave him no indication of that fact other than by sleeping with him (which, as it turns out, isn't a very strong indication at all, as women sleep with guys all the time for no reason other than wanting to sleep with them).
The easiest way to avoid this situation is to be 100% clear and upfront about your intentions from the getgo, which incidentally is the exact same advice I give to guys on here. That's right--I instruct guys who only want sex from a girl to make sure the girl knows this BEFORE any sex actually occurs.
Similarly, if you want a relationship you need to be clear that you're not interested in meaningless physical pleasures (although I would suggest giving meaningless physical pleasures a shot, cause they're pretty damn fun

).
So in the future, remember, the steps are 1) figure out what you want, then 2) act accordingly.
Hope this helps
Your boy,
870