Op,
Whether he's telling the truth (he's not) or lying (he most definitely is) is irrelevant.
He ghosted you. He blocked you.
That is who he is.
As you are not a teenager you do not need that level of drama in your life.
This is what i think happened:
He liked you, but was still looking elsewhere.
He saw someone he thought he might like more than you.
He tried her out for a few weeks .
It didn't work out.
He decides that he's got nothing to lose by giving it another shot with you.
He lays it on thick about the ex, the kids, the house blah blah blah in the hope you'll go "oh you poor sweet baby, come lay your head against my warm heaving bosom".
And if you don't, well he'll just try the next one on his list.
Seriously, life is too short to put up with shitty self centred men.
If you let him back into your life he will do this over and over and over and over and over.
Every argument, every disagreement, every time he doesn't want to do what you want, every time he sees someone's he fancies he'll go AWOL and then come back with some sob story.
Don't do this to yourself.
Tell him to fuck off and then block him.
You'll live to regret it if you give him a second chance