I'm a guy, and was in this spot when I was around 17. I had this really hot girlfriend, and was pretty cocky after we had dated 6 months. I started messing around at this party with one of her friends, nothing bad really, and I truly didn't realize how much I'd fallen for her until she dropped the bombshell on me a week later. I was crushed, and I realized it was real love, for the first time. I did some crazy things to win her back, didn't work, and I was wreck. I became a little obsessed and this just made things worse and then impacted other friendships, even my male friends. I had two choices at this point, as I was on my last emotional legs, go completely crazy (no-one wins) or move on. Moving on doesn't necessarily mean its over, but for your own sake, you need to think of it that way and take an emotional break. Don't e-mail, don't text, just focus on positive things for yourself that make you feel better, like working out, learning something new, change of scenery etc.
One thing though, the emotion is hard, very hard, I never showed it in public, just at night, and when you are on your own, a little release does no harm. Try and put on a stiff upper lip when you are out, pretty soon you won't need it, it will be normal you. I grew up stronger for it and even though we never got back together, we are friends now, 20 years on.
What you are going through is not dumb, its very real and the key message is time heals this and you grow to treasure your first love. So you may not feel it now, but you are less upset and less in shock than you were a week ago, and next week will be better etc. Time will heal, but you need to realize its over, at least for now. If you get another offer from him to be friends, take it, and appologize for what he may see as your irrational behaviour, but don't expect anything from him and only let him lead this friendship.
You seem to read men well, we need our space and we don't need or like drama, what happened, happened, can't be undone, just learn from it. I would follow your plan for the 6 month hiatus, no contact unless he calls you and then go very slowly. If he wants to get back together with you, be careful and defensive of your own emotions this time. Good luck, you are not alone, will never be alone, trust me on that!