As far as the cheating thing, I don't see this as cheating
If you guys are on a break, something has to be out of the ordinary or else you wouldn't be on a break, you'd still be dating. And a break is universally seen as just that, which means you are in essence...free, for the time being.

My advice as far as not getting the physical intimacy you long for with him is: I think you should do just what you suggested yourself. If I were you and if this was a big issue for me and tended to always creep up and bother me even when things were going great, I would just lay it out flat and tell him, you know, this is just something I'm looking for right now, something I need right now to be satisfied in my relationship, and seeing as you're not ready for it, maybe we can go our own separate ways and I can give you a chance to get more comfortable with it or something, then when you feel ready give me a call and depending on the circumstances, we can give it another shot.

It is rather unusual for the guy to be the one wanting to wait, so this may be a security issue or something of the sort. If he hasn't given in by now, what's it going to take?