My Ex is a total A--HOLE!! 

Okay let me start out by saying that my ex of course left me for a tramp and they live together now and of course his visitation with the boys have steadily started dropping off this summer until now he tells my 15 yr old that he doesn't have alot of money so he has to get a 2nd job and has to change visitation around a bit.  He doesn't talk to me and won't talk to me because I have him back in court over price reduction on the house and contempt for that and all.  After I filed against him he came to my work and threatened me and harassed me about the contempt charges because he knows he's screwed, so now he's not talking to me he told me he hates my guts and doesn't even want to look at me or talk to me.  Oh well--feeling's mutual.  But it's kind of hard to have so called "shared parenting" when you don't communicate.  Basically this shared parenting crap is exactly that--crap!!  He hardly sees them, he texts my oldest son all the time (like a teenager would a friend!!) and he doesn't even talk to my 9 yr old son at all unless he has to.  OK now the latest he has done--he whines around in court about having no money and can't afford to take a loss on the house and all that's why he won't do a price reduction--anyways my oldest son told me tonight--months ago his X-box game broke and doesn't work anymore, but we could send it in to X-box company and pay $99. to get it fixed, his dad refused to pay the money saying we should pay half.  Well now he's telling my son - this weekend is supposed to be his weekend to have them and he told my son that he would bring him a new X-box game system on Sunday and he can't get them this weekend--ya know he's poor and all and has to get a 2nd job--whatever--he's spending time with the ho playing house and all.  Well he told them he could take them to lunch and he's getting him the new X-box as an early Christmas present.  I was told that legally I can tell him if you don't pick them up at your regular time on Friday at 6:00 then you forfeit your weekend with the boys and that's that.  I'm about ready to tell him that, because I'm sick and tired of rearranging my schedule around his and when its convenient for him to come and pick the boys up for a few hours and that's it, so he can play "dad" for a little while.  It's aggravating as hell--because he should want the boys all weekend but he clearly doesn't.  No wonder I have my 9 yr old in counseling and at a support group with other kids--because he's feeling rejection big time.  I'm thinking about not letting the boys go with him on Sunday, but on the other hand I feel that if he finally spends time with them --even though it's not alot of time--I should let them go if they want to.  Of course the older one will want to go since he's being "bought"  with the x-box and all.  See my ex's mom when he was younger didn't spend alot of time with him and was never around--she worked all the time and she basically bought him stuff to make up for not being around--he's doing the exact same thing!!  Pitiful if you ask me and I'm sick of it.  He needs to grow some gonads and be a real dad for once in his sorry ass life!!  Any advice would be greatly appreciated!!! :)