How do you handle being single again?

I've been in a relationship for over a year and now I'm single and feel just lost. I am in so much pain and don't know how to be single.

It doesn't help that the guy I was with was like my best friend and now we can't even talk like that anymore 😪
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So he drunk called me last night and I got some clarity and relief. I still feel in pain but I at least feel better knowing he's in as much pain as I am. I'm starting to accept it and know I need to move on.
How do you handle being single again?
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