Should i just let go or explain?

I don't know what to do I dated this guy for about four months but we had been talking and hanging out a long time before he asked me out. I broke up with him but I don't even really know why. I think watching my sisters relationship kind of go down the drain scared me so I think I avoided him for about a week and then at a game he walked right past me, didn't look at me or any thing, I thought about my sisters jerk of a boyfriend and got scared and then mad and I broke up with him. I regretted it right after I did it but didn't know how to tell him because I didn't understand why I did it then. We didn't talk or anything until I started helping with my sisters prom, he is the same age as my sister so he was there to. The teacher made us work together on everything and it was awkward the first few days but then we started to fall back into what we would have done before, we talked and joked around and just did what we used to. The one day I wasn't in my sister said everyone was asking him what was going on with us but he just smiled and kept working, when I got in he had gone home but they asked me the same thing and I told them that I had no clue, that was about two months after we broke up. He has been talking to one of my friends and I know she likes him, or used to, but I don't know if she would go out with him. I have one question.....ARE GUYS BLIND!?!? Everyone saw, Everyone still sees that I still like him they tell me he still likes me but after all that I don't think it would matter. I don't know what to do, he's sweet, he's funny, he jokes around but still takes things seriously, he's protective, but not overbearing. He stayed at my families Christmas even through my cousin asking him every question she could think of, even let her look at his drivers license. I know after everything I said this is just going to sound sappy and cliched but I think I actually love him. I just don't know if I should explain everything and try again or just let him go.