Should I break up with my partner(sending photo's of his privates)?

Frustrating to say the least, you do need to talk to him and let him know how upsetting this is, and why the behaviour is not acceptable, I think he already knows it is not acceptable, ask him about the rule of you do things only that you would do in front of each other. There would have to be a serious turn around or counselling or something to fix it.