How do you let go when you know this person is the one?

My ex called me up and told me he had a dream about us. In the dream, I showed up at his parents place and we ended up having sex in his old room and he said it was wild and crazy. And then proceeded to tell me that he still loves me and finds me very attractive still. It hurts so damn much hearing this. I know why he broke up with me and it was valid but I still want to be with him.

I know I need to let him go but it's hard to do that when I know in my heart of hearts he is the one.

I can't sleep because of this. I can't ever really sleep because of the breakup. My heart is so broken.
How do you let go when you know this person is the one?
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