You are worth more than just being a hookup.
If you want an actual relationship keep sex out of it, no talking about it, sexting, exchanging photos of that type. If they just want a lay let them find someone else.
Take time to know each other, respect each other, care about each other, and the sex will mean something, and a relationship will have a chance.
Sex means more to women (most), than men, so take care of yourself. Forget that guy, it was just sex to him. Move on. Good luck!