Wait until you have been completely over him for at least a year.
Two reasons why:
(1) if you are not completely over him when you start to communicate with him again, your old habit of being attached to him will reassert itself and you will be right back in it
(2) Since couples who can make it work DO make it work, you break up means that you two will never succeed as a couple. So if you do get back with him, there will only be the same result .. another painful breakup.
Blocking each other on ALL social media is a good idea. For the first year, at least.
It would appear that he has not let go or moved on. Most people take 4-8 months to get over a breakup, but our brain resists change (including letting go), and if someone is NOT totally over a breakup within a year, they are not likely to figure out how unless they talk with a therapist.
And some people have a "victim mentality" where they SEEK suffering ... mostly because that is what their brain patterns are used to, and the brain always seeks what it knows, even if it is unpleasant.
So perhaps he wants to get back with you because he has a victim mentality. Although I don't know him so I really cannot say.