Is my masturbating a moral reason for him to see other women?

My husband caught me masturbating myself.I thought he was asleep.We had sex 2 hours earlier.I was discreet,on my front and needed release after I won an Oscar at Faking an Orgasm. I usually masturbate on my front so he doesnt notice, but he says he has been aware of it since we began our relashionship and it has really upset his ego.He cant understand why I would need to play with myself after sex with him and he is ENORMOUSLY PROUD of his 10 inches.I really love him though and now he says that if I want to continue with him I will have to put up with other women.