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Possibly he didn’t want to be asked on social media about the break up. Also possible he doesn’t want to see you or pictures of you doing things and doesn’t want to stalk you or be apart of it until he’s personally over you completely before seeing you on Facebook again. Could have wanted to change his life over all and felt Facebook was a negative part to that. There are guys that don’t have Facebook at all so it’s not that weird. I’ve deactivated an account on after a break up as it was a convenient time to change.
So they can't be stalked and/or they don't have to see reminders of things or people related to their exes.