Questions: Break Up & Divorce

I broke up with my boyfriend. He isn't taking it seriously. Because, when we argue sometimes I block him. But, I actually do want to move on with my life without him. I feel kind of guilty for blocking him because I think it feels cruel. But, I don't want him saying sweet nothings to me to where I FEEL like working things out.
We have fundamental disagreements. He had inappropriate online relationships when several different women. He has stopped the inappropriate conversations, but he still talks to them from time to time. Even though they are regular conversations NOW, it doesn't change the fact the he is still in contact with these people.

Sad to say, but the question was inspired by my parents.

My mom was and still is miserable being with my father and talked about leaving him a lot growing up, but never did. She has become extremely bitter, even now, that she didn't do more with her life because of his expectations of the women in the family and now his medical issues forcing her to care for him even further.

Me and my man have many arguments
Even over small things
We have broken up several times
And im always the one packing my clothes when we fight
Him saying "im done, i dont want to see u again, i will not message/call"
Vice versa..
But 90% of the time he calls and tries to come back to me
And we get back together

Then yesterday morning we had a good time just going to a park and joking around
And having a laugh

Then we got home and we had an argument about a tv show
And then he got angry and just broke up with me
"Im done, you always argue every week, im done with your crap, i can't take this anymore"

And then we bickered back and forth
I started packing my clothes
Then he said
"F**k this. I dont deserve this. I dont love u anymore, I dont care about u anymore, go find someone else"

And then he dropped me home
He was still angry

Is this final?
How could he switch to not loving me and not caring about me in 1 second?