How do you cope with a possible breakup?

My boyfriend said today that he doesn't know if he wants to still be with me and it hurts so fucking much. I don't know what to do. I feel so lost.

I don't know who I am without him. We've been together over a year now and I thought things were okay.
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8 mo
He broke up with me 😢
How do you cope with a possible breakup?
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