i say make amends ... stop saying sorry and stop expecting him to get over it, and just promise him you will tell him EVERYTHING ..... and KEEP that promise, and maybe one day he will find this to be a distant flaw
good point ... in THAT scenario you need to tell him that if he refuses to listen or to talk, that is not a relationship, and he needs to decide whether he is gonn have a relationship, including talking things out, or whether he is going to lose you
after all, i get the feeling you are trying, and thats all you can do
i read your other replies and it seems he is playing hard to get or he is really hurt one of the two.
like someone else already said, STOP feeling sorry tell him straight up,what you did was wrong an you know it.that from now on you will tell him everything,he can either take it or leave it.