Me and my ex split up and agreed to block each other and he still hasn't?

Me and my ex have decided to end our relationship and as we did it we both agreed the best thing to do would be to block eachother.

He still hasn’t blocked me and I messaged him to say we both agreed to block each other so we need to do it and it still hasn’t.

why is this?
Me and my ex split up and agreed to block each other and he still hasn't?
Post Opinion