Could really use some advice on how to let go and move on?

I gave my virginity to a guy I've known for a couple of years who meant a lot to me. I've always had trouble liking guys and wanting to get close to them. No one ever seemed right.. til this guy. He seemed perfect and I let my whole guard down and I didn't think he would hurt me like this. We had good times together and he really enjoyed the sex, we actually layed there and stared into each others eyes afterward. Everything seemed normal then he broke things off with me, deleted me from Facebook, and haven't heard from him since. He said he wanted to sleep around and I didn't seem like the type to put up with that. He told me I was wonderful but if we kept spending time together it would make it harder to stop and life was too short and there are too many people to meet. It's been a month and I feel like a different person. I still find myself missing him :/ a new guy is in my life and knows what I'm going through and has offered to give me time but I feel like I can't get close to someone again. I kissed the new guy the other night and it just didn't feel right... left me wanting to kiss the old one. Since then I have also lost my car and my stress level is insane. I've had so much trouble eating, eating makes me sick. I've lost 11 pounds unintentionally. I try to surround myself with friends but in the end I find myself alone a lot, especially at night and I get really sad and cry often. I think about him too much. And I haven't slept in my room since the morning I woke up to his text about leaving me. It scares me to be in there alone. I'm not sure I can ever sleep in there again. I know it sounds crazy.. but I just sleep in the living room. There is also a shirt in my room that smells like him and I can't even touch it. Watching tv shows or hearing songs that we listened to together makes me feel so sick and sad, its unbelievable.. We have mutual friends too and its like I can't escape him. I'm good friends with his best friend who keeps telling me I should try to get back on his good side because he wants us all to be able to get along and hang out. And when he mentions his name it hurts ny heart.I'm just sad all the time even if I don't show it. Sure I have good times with my friends but it is all temporary. No one knows just how bad this has affected me but it is BAD. I try to cover it up and not bother anyone with my problems. I'm scared and I don't know how to cope. I want to be over him but I don't know how. I feel like I'm losing my mind. What should I do?