I think you need to set your own boundaries for yourself, and not act a specific way because that's what HIS boundaries are...

This won't sound right, but it's the only thing I can think of: Lower your expectations. Better yet, don't have any for a while.
Maybe your boundaries could be that you won't text or call for..say..4 days? Then only reply one time?
I'm not saying that specifically, but perhaps write out some rules for yourself and stick to them...make it a challenge