Should I reduce or cancel childsupport payments for my ex-husband?

I just went to court on my children's father for child support. I have had a rocky relationship with this man for a long time. I started getting support when I got a divorce from him because he made a baby by another woman at his job. This lady put him on child support first, and was getting $88 a week for one child. I was leaving out the marriage with only two children, and was only getting $69 a week for two. I had a job and was doing more of the work of being there for our children then he was. He would quit jobs and I would be stuck for months doing all the work trying to support our kids. He never been up to their school to check on them or take them to the doctor when they are sick and stay up all night getting them well. He later on got married to a woman that had two children with him and didn't care that my children was only getting peanuts. He would lie to me and say that he couldn't pick up my children some weekends because he had to work out of town. I would go to his facebook page and see that he was at the mall with his family buying shoes and coats for his two children that stay with him having a great family day. Here it was my child support had stopped for a whole year and I didn't get any money, and I had asked him for a coat for my daughter and he said that he was broke. I go back to court after years of not asking for a increase to find out by him that his other child mother who I left him over in the first place was getting $500 a month now for one child and my child support was $0 for a whole year for two children. It was like he always kept his other child payments up on his other case, but not mines. I was granted $650.00 a month along with back pay for the time he wasn't paying. I could tell that he really was not happy with the outcome. I didn't ask them to give me this amount or back pay.I just wonted what was fair for our two children we have by each other. I was thankful for whatever help I could get to take care of them. I don't understand why Im being attacked when his first child gets $500 a month and for years I was getting $276 a month until it stopped for one year due to him changing jobs. This man makes around $44,000 a year now and he has been able to buy his two girls diamonds and everything else while giving me the Im broke song. He talked to me after the case and told me that he was not going to be able afford the payments if both children's mother cases is getting big amounts. I asked him if he cant afford the payments then why did he sign the papers agreeing to the amounts, and he said he didn't know. He also said he was not going to be able to see the kids anymore because he was going to have to work a second job to try to support his family he has. I said I would try to work with him on a good amount for our children and get the back pay cut as well as the child support payments lowered. I soon check his face book that he dont know I read online to see he is bad talking me. I see his friends calling me a greedy baby mother and how he such a good father and I better enjoy my increase because he will not be paying it for long. Now he wont get the children because of the out come and my kids don't understand whats going on. Im sad inside, and just wont to cancel it all so he wont hate my children because of me getting more support now. I have been getting the short end of the stick by this man for a long time ,and just really wont to see my kids be happy by getting love from both parents. Should I get the payments and have depressed children because the father claims he wont be able to see them because of working more or cancel the order and allow him to give whatever is in his heart so he can still try to spend time with them?