Help! Why is he doing this?

Help! Why is he doing this? Was with a guy for 8 months it was the most romantic, worldwind on emotion and I fell completely in love with him. Some stuff happened things ended quickly and badly, he quickly moved on and quickly came back. We started talking again and the feelings are still as strong, but it different as it would be. Now it's ended because he was to scared to commit due to pass experience. But he doesn't even want to be my friend after putting in his own head that I've been with someone else when I haven't. But after realising I hadn't he couldn't stay away when he saw me.. He wouldn't look away from me.. I don't understand... Is it simply he doesn't want me but doesn't want anyone else to have me?
Help! Why is he doing this?
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