Does he just want a drunken fling? Should I give him a chance?

You want a guy like that xx. He only wants you for sex, a guy who calls after 10p.m only want sex, it's a booty call. He does not respect you, by saying hows your weekendx. The x is his way of thinking your easy. Get rid of him, don't call him , take him off of facebook, tell him off first, no more free sex when he wants it.