What do you want?
You are spending a huge amount of energy going over and over the ins and outs of his life/ex/kids/divorce. This is not fun for you!
The first few months of a new relationship should be amazing and fun and the bit where you are both on your best behaviour and trying to impress each other. It should exciting and most of all, you should be enjoying yourself.
You are definitely not enjoying yourself. You are investing most of your energy in overanalysing everything he has said and done with regard to his frankly complicated life.
How do you really feel? Is this what you want? Focus on yourself instead of him and think about whether his erratic up and down contact is making you happy.
You are spending so much time focusing on the whys and wherefores of his life that you seem to have forgotten that you have a choice here. If this isn't making you happy, you can walk away.
Give yourself some value! You aren't a support human who is there to mop his brow when he has a financial argument with his ex. You deserve someone who will be invested in you; want to see you, do things and get to know eachother and maybe build a relationship.
But all this hassle and uncertainty after only a few months? Walk away. You are worth so much more than this. And maybe think about some counselling - it might be useful to explore why you are focussing so much energy outwards instead of thinking about what you want - you are allowed to have needs and wants and desires and you deserve someone who will respect that and respect you.
As my grandmother used to say, "Put a price in your head!". 