I don't know why I'm upset.

I feel betrayed, hurt, and slightly disgusted. My husband is trying to figure out why, but I honestly can't pinpoint it.

Here's the short of it: I have PCOS and went on the pill to manage my horrible cramps. It destroyed my sex drive. Sex is painful. Ergo, we started having sex once a week (or so) instead of our usual every-other-day. This was several months ago. Yesterday my husband confessed that he's been masturbating 5+ times a week, sometimes to porn. I have nothing against masturbation or porn. So why do I feel so betrayed?

Honestly, if he had said to me "I'm really uncomfortable, and I need for something to happen" I would have come up with something. Oral, grinding, something. I don't want him to have to masturbate, and if I new how serious the issue was, we could have compromised. But now my husband is asking me why I'm so bothered, especially since I used to masturbate (I never hid it from him tho). But I can't figure out exactly why it is I'm so upset. Any advice?