My girlfriend is mad that I don't want blowjobs anymore

I'm M28 and she's F23.

In the first 3 months of our relationship blow jobs and oral were a regular part of our sexlife. But it slowly tapered off. I would ask for them and sometimes she would do it, but most time she did not feel like it.

Then she would require me to wash my penis every single time I would get any oral. Even if I was clean already or fresh out of the shower. So it was never spontaneous after that.

I stopped asking for it because she couldn't last more than 30 seconds to 2 minutes anyway and I wasn't that into it because she didn't really seem to be either. It just made me feel like my body is disgusting.

So a lot of month passed and she randomly offered to give me a oral. I simply said no thank you and she seemed surprised. She asked again a couple of days later and I stiil said I didn't feel like it.

The third time she kinda demanded why I didn't want it. 

I said that I didn't want to get my hopes up that this will be a regular thing. I knew if she gave me oral that evening, it would be at least 4 months before she offered again. And I would rather live without.

She didn't like the idea of me refusing oral. I think it hurt her ego that I refused her offer. So she asked me what it would take for me to want it again. So I said I want it to happen at least once a month as foreplay to our regular sex at least. She quickly agreed and it lasted two months.

Same thing happened and I reminded her that she already broke that promise. So we tried again. And that lasted three months and then it stopped again.

I feel like shit. It hurts my feelings that she doesn't seem to care enough to hold a promise of just once a month. 

I feel like I'm too gross and that she probably hates it but won't let it go because she can't handle the thought that I won't see her in that sexual way - she loves feeling sexy and me refusing her offer would make her feel unsexy. I don't even think it's about me.

I keep trying to remind my self that I'm not gross and I do have good hygiene. My past lovers had no problems and I've always been open about hygien amd asked if I smell or if somethings off. Those in the past always commended my hygiene. Yet I feel gross.

Am I wrong?