Cheating should be the farthest thing from your mind whether you are happy or not. If you are not happy, end the relationship first. Before you move on to something else, make sure it is over and all loose ends are tied up.
When I pursue someone, I'm 100% available. There's no sneaking around. You can call me, see me, etc. anytime. There are no grey areas with me. And I expect the same from him.