How often do you think a couple should be having sex?

I know this is different for everyone, but personally I think there should be a certain amount of sex in a healthy, loving relationship. I’m asking everyones opinion because the person I’ve been with (currently finding a way out of the relationship) will say things like “you never want to have sex”. Even when we had sex earlier that day. Now these comments irritate the f*** out of me because even when I don’t really feel like it I still try to put out every 3 days at the least. Its getting even less now only because I’m losing faith in the relationship. But before when we were really in love we’d have sex almost everyday. I think I’m being more than generous even when I shouldn’t feel obligated.

Now putting aside the fact that my relationship is on its way out, what does everyone think of normal and healthy relationships out there? How often do you think a couple should have sex?

Thanks for any advice and opinions.