How do I find out why he's doing this to me?

My boyfriend just recently broke up with me, and it's completely tearing me to shreds. I can't stop thinking about him, what he's doing, and most of all, why he broke it off in the first place. He said he needed some 'time to think' and he needed to be single right now. We agreed to still be friends, because we were best friends before we started dating, and we still share a bond. Thing is, I saw him today, and though he still seemed to be acting strangely (he told me he was upset because he didn't know what was going on in his mind) and he looked like he was genuinely sad about hurting me and hurting himself, he told me I was his best friend and that would never change and he told me he would text me later today. It's 2 hours til midnight and he still hasn't contacted me. I'm just confused and in so much pain because of what he promised and what he's actually doing (or not doing.) I'm tired of hurting, and he's caused me so much of it, and he knows I'm so madly in love with him. I'm not trying to be 'that girl,' the damsel in distress, but I feel like I deserve answers, because I was part of the relationship and it was so sudden and out of the blue. I want to contact him so badly it hurts, but I don't know if I should, because I worry it will make things worse. However, the last time I saw him he acted completely fine and we were totally okay with seeing each other. I'm in such a scared, frightened, perplexed state, and I don't know how to handle this. How should I go about contacting him, or should I wait (which I really don't think will make things better, but i could be wrong), or should I do something completely different? Sorry for the long explanation, I could just use some good advice. Please no hurtful comments, I can't handle them right now.