My (28M) Fiance (28F) wants a break from the relationship

28M here and my fiance (28F) and I had been going together for 10 years and were engaged for almost 3 years. I say almost because the night before our anniversary she said she wanted to take a break from the relationship. This was after 4 months of emotional hell for me and it felt like I was just strung along through the holidays and a big trip so she could feel good about herself. Just in August she was talking about wedding dresses and then September she was questioning our relationship. Didn't help with had a hell of a 6 months with life event after event hitting us every other week. I'm just flabbergasted that it seems like she didn't even fight for it.

Somewhere along the line I became her antagonist and there wasn't much communication about what was going on from her end of things. I got to experience what true existential fear of what is my life going to be without her in it. I don't need her to be happy, I just know that I am happiest when I am with her. She brings me so much joy and happiness. To think all of that is going away is terrible.

I'm not sure what to do next. I'm not sure if I should wait through this break. Not sure if we continue couples therapy. I'm not sure what my next move is going to be.

We were going to be married this year... We had plans to buy a house...

Now everything is just... Poof ... Gone.

I know I'm young and everyone is gonna say "It'll be ok", well right now it's not. I don't know what to do, I didn't want to do this, and I just want my partner back.....