Don’t be bitter about it, just be cool, confident, and honest.
If he’s into you, if he truly likes and respects you, he won’t let you go. Just like neediness is the biggest man-repeller, self-respect is the biggest man attractor.
If he isn’t getting out of a relationship, then it’s very likely his strong affections are a sign of some kind of attachment issues or self-esteem problems. If you’re in the early stages of dating, try not to see him more than 2-3 times a week.
If he’s a too intimate too soon kind of guy he’s going to try to see you more frequently, say no!
Hold your own and don’t be afraid to walk away when you don’t get what you want, this is the only way to have a shot at getting what you want.