How can you love someone yet still leave them?

Anonymous
my boyfriend and i have gone through a really tough time during 2017, before we used to be so great together. I literally love him so much and i don't want anyone else unless it's him :( but.. he says he doesn't want to be with me anymore because recently our relationship has been too stressful. I'm trying to work things out to get them back to how they used to be but he just says there isn't any point because in a month or so time we will be back in this same situation.
I don't know what to do, i'm at a lose-lose situation.. If we break up i honestly fear i will never be the same again, he sort of became my happy place even without me wanting him too be. But if we stay together i know he won't be happy because it's not what he wants therefore i won't be happy seeing him unhappy. There is just no winning in this situation !!!
I feel so heartbroken and lost, i just don't know what to do anymore. It feels like everything around me if falling apart..
He says he loves me and that i'm the love of him life but he doesn't want to be with me anymore and that this is best for both of us.
I don't understand how can you love someone yet let them go?

ps. no he isn't seeing someone else
How can you love someone yet still leave them?
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