You will really regret this.
You know that saying, when the chips are down? Well that was it. The chips were down, and he walked away from his children because it was easier. Put himself first, moved 190 miles away. Got on with his life. Oh of course he made attempts to be in contact, but it's nowhere near being the kind of father - the kind of person - who genuinely loves his children and puts them first. He would never ever have moved, for a start.
When you have children yourself, you will understand that absolute shift in the way you feel, that they are part of you and you just don't think of things in the same way. And you'll begin to see that some people - oh let's face it, 99999.99% of them are men - just don't feel like that. They are the ones who leave. The ones who pay lip service, and say some of the right things but when the chips are down, they don't love their children the way a child needs to be loved in order to grow up mentally healthy, and be the best they can be. They love themselves more than they can ever love a child. And they tend to be the ones who definitely love themselves more than a partner.
When you have your children, I hope they are with a different, better person, who does have the capacity to love like that and put their child first. Who would find it impossible to 'move on' from their own children.
I hope you don't have them with him, because you will look at this situation and you will change the way you feel about him, I guarantee it.
I have a friend in this position. They too have now split. He's now moved nearer to the first (now almost grown) children and is trying to 'make up for lost time'. Meanwhile, he's dropped their child like hot shit. Because he's capable of doing such a thing, and she's finding it all the harder to accept because she knew all along that that was him when the chips were down.