I broke up with my boyfriend yesterday, but I'm starting to wish I hadn't?

My ex boyfriend and I met about a month ago. We started dating after only hanging out twice. He is the sweetest,niceset guy I've ever met but he text me constantly and if i didnt reply he would worry and then he would facebook me and then call me and it was just way too overbearing and i had told him but he didn't really get it. he said he was sorry but he still kept at it, I dont think i was clear enough. Anyway a lot has been going on lately and I realized I just have too much pressure on me with school and work and trying to figure out what I'm going to do in life and I realized having a boyfriend is just too much for me right now so I broke up with him. I also told him how overbearring he was and how it drove me nuts and he said hes sorry and wishes he could fix it. I dont think Im ready for a relationship right now but at the same time I want him and I dont want anyone else to have him. I think we really have something special but the pressure of it all freaks me out! Should I tell him I want to start over? I just want to be friends for now and eventaully have it grow because everything had just happened so fast but I really dont want to lose him and it would crush me if he started dating anyone else but i know thats really selfish. What do I do?