Hello undercover 007, welcome to PC!

Why do you call him over and over again? This may sound like a stupid question but I think you need to know the source of your anxiety. If it's a trust issue then calling over and over isn't going to change what he's doing. If it's an anxiety issue (which I totally understand) then try to come to some sort of an agreement, like a simple premade text "sorry, can't talk now, I'll get back to you." I do not enjoy talking on the phone and I find three calls annoying, 20 would put me over the edge. With the technology these days not only does he know that you've called, but when so before you pick up the phone to call him again ask yourself if it's worth it and what you hope to accomplish.