Questions: Break Up & Divorce

How did you deal/overcome it?

Im so confused about my ex boyfriend
Giving me mixed signals and all

Me and my former partner had a massive bad break up 6 months ago
This week he's been sending me love messages to get see me and get back together
But then I said no and he started sending me rude messages

He keeps calling me b*tch, sl*t, h*e.. etc
Keeps saying I left him for another guy (which is not true)
Blah blah...
He keeps blocking and then unblocking when he wants to say something

Then today (a week later) he tried to add me on social media
And messaged me saying:
- he's sorry
- he's just angry because i moved on so quick and he couldnt
- he knows we can't be together anymore and he doesn't want to
- he wants to be civil and mature
- he's doing his own thing
- he doesn't want to interfere with my life
- he doesn't need or want anyone
- he recognizes I've always been there for him
- he wants to move on
- he wants to have each other on social media

I replied “i dont understand u…”
Then he replied “i dont either but thanks for accepting my add”

Why would he want to have each other on social media if he wants to move on?
Why would he add me again?
It doesn't make sense