Selfish partner.

95% of the time my partner gets off and then right after is just done. So I'm left sexually frustrated. It's getting really old. He gets EXTREMELY upset and we fight so bad if I masturbate so I cant even do that. It seriously ruins my whole mood and my whole day. I get so distant and bitter towards him. It makes me feel so resentful. We talk about it all the time and he says hes sorry and he will try to get me off but it never happens. Maybe once a month. I'm so fucking over it. What do it do!?