Trifle - you obviously aren't aware of what I am. My posts aren't offensive, they just don't kiss the backside of the OP all the time, which is allowed. You post something, you get the responses you ask for. Like on this post, the consensus is the OP is being unreasonable wanting no children and her DP's attention to herself. He has responsibilities and thankfully he maintained them.
It's talked about on the play ground, how parents do all they can to up their money since benefits cuts. Going to Uni is seen as a way of getting extra money.
If DP was already at Uni before meeting you, maybe a coincidence. But it sounds like any money received in child support is needed by the DC, he should be congratulated for supporting his DC. Today it was reported that unpaid child support goes into the billions.
You let him move into the house, you must have been aware at the time he couldn't contribute. You don't agree in the child support paid to his ex, but that is a matter between him and his ex. It shows he takes his responsibilities seriously which should be endearing.
He's trying to better himself at University to get a better paid job.
In the few years he can't contribute, consider the years when he's working and will be able to contribute.
If you're not happy that he didn't make you his priority when you got ill, kick him out. He'll be able to get his own accommodation and hopefully have more contact with his DC's which it sounds like they need.
The issues only appeared to stack up when you were ill. Like him not contributing to the bills meant by default, you ask, you get.
If it was the other way round and a Mum was posting that her ex had bailed on the children and paid little in child support people would be jumping up and down about that.
You are lucky to have a family that can take your children and support you. There's people out there who have to fend for themselves without this. So you are really lucky.
So if you are that annoyed at what he currently doesn't contribute, get rid. I doubt he's going to lesser those child support payments on your say so.