AITA for still not wanting marriage, even though she knew that, and is now really upset about it?

As someone who has been married and divorced before, I had mentioned quite early on in my relationship with my partner that I couldn't see myself getting married again, but that I'd love a life partner. She understood this, and actually agreed with me, and told me marriage wasn't something that bothered her.

We've now been together for 7 years. Over the course of the last 3 years, friends of hers have got married we've gone to the weddings and what not, and recently she told me that shed love for us to get married. I instantly felt awkward. I love her, truly, but I have no interest in getting married again and she knows this. I told her very gently to please not say that, because I love our relationship, I love her with all my heart, but marriage is something that puts me off after my past experience. And I also brought up that she knew this and said she understood this. She responded with "I know I know, but I can change my mind." So I said "Pease know how much I love you, but I won't change my mind when it comes to marriage. I don't want to get married again." She got upset, which upset me.

She now has it her mind that "if I loved her and thought this relationship was a sure thing, that I would WANT to marry her, regardless of my past experience and the fact that I don't want to marry her makes her think that I think this relationship isn't built to last, and dont want to commit." And that's NOT the case at all. This all came SO out of the blue. We have an amazing relationship. But now I feel really awkward and thrown by the things she's saying. We were both upset and I asked her if she wanted to end things. She said "Do you? " I responded "No! Not atall! I want to be with you." She replied "But you don't want to marry me?" Which just really threw me off even more. It's not about me not wanting to marry HER, it's about marriage in general. I tried to explain this to her the best I could, but shes just suddenly changed her tune, after being absolutely fine for the last 7 years, and knowing from fairly early on how I felt, and accepting, and understanding it.

It's now caused a rift in our relationship. And I've got a horrible feeling this might end us. I don't want that. But the ball is in her court and she's besb a little distant since that talk. I'm now paranoid she's going to leave me. But I can't marry someone again. Its not about not wanting to commit to her. I've said this, I've explained this.

I've had a couple of friends "joke" and say "Oh just marry her." But I CAN'T.

What I'm basically asking is, AITA for risking losing her, because I don't want marriage again, even though she knew that? AITA for not just marrying her purely to keep her with me. ?

I'd absolutely understand if the marriage talk was something we'd never had before this point. But we HAVE had that talk. This is why this is all devastating to me.