Getting back together?

I used to date this really sweet guy but I had never been in a relationship before and I freaked and broke up with him. I haven’t been able to stop regretting it for a while. I don’t really know how to go about getting back together if it’s possible without seeming shallow in my efforts. We are still friends, but I don’t know if I want to risk that friendship for a second try at a relationship or just keep trying to move on. I really do value him as a friend, but I couldn’t live with myself if I didn’t acknowledge my feelings for him.