No interest on his part. For some reason you aren't getting what we're saying. He's merely bored. That's why he talks to you randomly. It's only when he's bored. If he were interested, he wouldn't be so sporadic about it. You really do need to move on, and not lower yourself to his level. He only wants to talk when HE gets the urge. And like others said, he's probably only interested in sex, if even that.