Most Helpful Girl
I know how this goes because I just got over a dude exactly like this. When we first broke up, I stayed in bed for a good 3 weeks and had panic attacks. It was probably the worst 3 weeks of my life. We were together for 2 years and he was my best friend throughout those 2 years. I barely talked to anyone else because we were always together. We broke up 3 months ago and a few weeks ago I finally started to realize that he's not worth the emotional stress.
I deleted his phone number and I blocked him on all social networking sites. Not because he was bothering me, but so I couldn't look him up and re-add him again or text him to tell him "I miss you". I started talking to old friends that I hadn't really talked to when I was with him due to him taking up all of my time. Other dudes started talking to me because I was single and I realized that I could do better, and could find someone that wouldn't drop me so easily. Him and I haven't spoken since we broke up and I can honestly say I'm over him.
It's hard at first, but it gets easier. Literally delete him from your life and distract yourself with other people's company. It works.