Guys, how would you react if your girlfriend says she can't marry you?

You have been almost 3 years together. 2 of which living together. But she will move to other country and after some lack of support from you she realises she couldn't marry you. She loves you but can't feel that certainty that you are the one she will grow old with. So she thinks you should go separate ways.
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He's trying to convince me to go back to him and telling me I'm making a mistake and that I have silly dreams. He doesn't leave the house and keeps saying he won't be the same and that he does see a future with me. I don't want to be mean, but it feels like a lack of pride and respect. And that he thinks I have no saying on my future.
Guys, how would you react if your girlfriend says she can't marry you?
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