I think the most telling thing about your post is the heading, MALE masturbation.
This leads me to believe that either you don't do it ( which I find impossible to accept ) or you have double standards.
I'm not asking whether you do or don't, that's your business and nobody elses. But if you do, but not as regularly as your bf, then isn't it just a question of different appetites ?
I do it LOADS more than Mr.P, and he has no problem with that, it keeps me happy, and as long as we are there for each other when we both want to be ' together ', where's the harm ?
And as for phoning chat lines, it's just titillation, expensive but harmless.
However, if you REALLY have a problem with it, let him know big time, it sounds as if you've casually mentioned it and he's brushed it off. Papering over the cracks never works, sometimes major reconstruction work is called for.
If you're meant to be together you will rebuild it .
Good luck, and be confident x x