ROMB, the fact you are taking the high road speaks volumes about who you are and who you are becoming. You are proving yourself to be very strong, even though it might not feel like it all the time.
I guess if your H wants to stop snooping, he'll have to be the one to separate the phone plans. Doesn't he know that snooping just makes you miserable? Hasn't he talked to anyone on this board? Seriously, you have nothing to hide, and I think you're right - what's the point in you initiating splitting up the phone bill?
The mystery you're creating may not be a bad thing.