I'm fuming. Is this right?

[Melly01]

XP just called. He has basically said, the business he started has been merged with another business. Something about him earning $60k a year at the moment, and something about shares will bring it up to about $100k. He has asked that we set up a private CS payment agreement because:
He doesn't want to have to pay "too much" in CS
He doesn't want me supposedly "living off" his payments
That he doesn't want to be paying so much so that in a COUPLE of years, when he wants to buy a house, he will be able to. (DS & I are living with my mother at the moment, otherwise I doubt I could afford rent, food, and child care payments as well as all the other stuff I'd have to pay if I were living alone.)
And if I don't agree to a private agreement he will go after formal access rights.

I did an estimate and the way things are now, it's estimated he should have to pay:
$1005.58 per month
Annually $12067.00
Weekly $231.26

He currently pays $36.19 per month, that was only just changed from $25.98 per month.

I think he must be worried because it's almost the end of tax time, and I'm assuming he hasn't done his tax yet.
I don't know what to do.
He doesn't even see DS now, and I tell him he can come whenever, unless we have other plans then he'd need to work around that. He called at Easter to try and arrange something and we had a couple of busy weekends so I asked that he come up with something else. He then suggested that maybe DS shouldn't know his father.
He doesn't call just to ask about DS, or talk to him, it's always something else. He has called maybe less than 10 times since the start of the year. It's so frustrating, he chose to move away from DS, so that it is more of an effort to see him. I don't drive and I am on parenting payment single as well as studying full time, so I cannot afford to take DS to see him at the moment. Plus the verbal abuse I suffer from him doesn't make me jump at the chance to go all the way to Mudgee and be stuck there to be yelled at and berated in front of DS.

I am just so mad, I'm shaking and I want to cry. Why does he think he can be a father when he feels like it? And why does he not think his own son is entitled to what CS thinks is a reasonable payment?

I told him I would look at what the estimator comes up with and then try to come up wth a "reasonable sum" based on that. I think I will have to call them tomorrow as I cannot cope with this at the moment. It's just unfathomable that he would suggest that.

Sorry, I think I needed to vent more than anything.