Most Helpful Guy
Definitely cease all contact with him. Blocked number, no Facebook, etc. Moving on will be next to impossible if you're still talking to him.
Most people say to take half the length of the relationship to heal and move on. Best guess, it'll be 3-4 months at least before you start to feel a little better about it, and then you can start getting over him.
Some guys will say you should hook up with someone else to get over him, but they're just trying to take advantage of your fragile emotional state, and it's not really gonna help you.