[del677]

Maybe he masturbates too much and needs to cut back on that when he's expecting to be with you in a few days.

It's probably more psychological on his part. I understand how the first thought could be, "It must be something about me he doesn't like," but that's just an egocentric viewpoint. (Which is common. We all think, "It's all about me!" But we are happier when we're not thinking that.)