Can I win my ex back?

Hi, everyone. My boyfriend broke up with me a few days ago. He told me that he "fell out of love with me" and didn't see himself marrying me.

We met to talk in person after the breakup, and he said that he didn't like that we bickered and that he felt like he couldn't hang out with his friends. I told him that he didn't give me a chance to fix our problems, but he said he thought it was too late and that his feelings had changed. He said that for right now, he was sure of his decision, didn't want to hurt me, but wanted "something new."

We have been together for three years and have been through hell together -- grad school, health issues, and financial issues.

I love this man with all my heart and really want to win him back. Is there any hope? If so, what should I do?
Can I win my ex back?
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