Most Helpful Girl
Only time can heal this kind of wound :/ Surround yourself with people who love you and will care for you, and remind you about how bad your relationship was with your ex. I've been in your boat before, and I got over it by talking to other guys and realizing that there are plenty other fish in the sea, who are more suitable for you than your ex. Don't get into anything serious right away. There's nothing wrong with a little bit of rebound as long as you tell the guy that you're just looking for someone to be there for you and cuddle you if necessary, nothing more. Try that, you'll feel better if you're not going through it so alone. Call up a guy friend that you may have buried deep in the friend zone a long time ago, and go out with him. Some no-pressure, platonic, comfortable male attention will keep your mind off of how heart broken you are. I know your heart may not be in it, but as time goes on, it will feel more and more natural. I think that hanging out with your girlfriends might make it worse because they want to talk about it with you, while a guy friend won't. Guys are good at not talking about that sort of thing.
Also, consider taking up new hobbies. Start running, or learn to knit, just put effort into making your own self happy. Do what makes you feel good about yourself, and in general. Take all the love you had for him, and put it on yourself. You deserve it!
I hope you feel better soon, I'm sorry you're heart broken :/