Are you saying that he has decided not to talk to you for 3 days as retaliation for your not "providing" him sex??? Is that what he's doing?
I'm not sure I understand your post. But if that IS what he's doing, it's childish, and it's abusive! My ex used to pull stuff like that, only he'd do it much longer than 3 days.
So evidently he feels he provides ALL your emotional needs? Hmmm, for some reason I'm not quite believing that from what you say.

And you should NOT have to appear naked on webcam! I'm not even sure that's legal!!!
Perhaps counseling would help both of you. He seems to have some unrealistic expectations. See what a counselor says and maybe you two can come to some sort of agreement on things. God bless & take care. Hugs, Lee