Why did my ex boyfriend contact me years later?

This guy was my first everything - first love, first time, first boyfriend. He broke up with me by telling me he cheated and it was devastating. It took me over a year to get over him. Flash forward to now - it's been 5 years and we've had absolutely no contact until this weekend when he sent me a Facebook message finally responding to a 5 year old message I sent him (post breakup) explaining how he hurt me. He also tried to add me as a Facebook friend. I'm just baffled by this as it's completely out of the blue and I genuinely thought I would never talk to him again.

Guys - what do you think his motivation is here? Why do you think he contacted me?
Why did my ex boyfriend contact me years later?
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