I need some real advice I'm no trying I be a downer I really need to know what to do I have know one to talk to this about.

Okay so for the record me and my spouse are still separated so I have the kids Thursday thru Monday he get them Monday thru Wednesday. He was suppose to come this Saturday and last Saturday but did not show up to spend tine with the kids since it was his off day. so I tried calling hi to see what happen but his phone is off and his dad phone that I called once because of a emergency is now off (it was cut off a couple of day after I had called) his Anut phone I don't have her new number so I wrote her on Fb I was blocked and all I said was hi. He comes tomorrow for the older kids (he has nothing to do with the youngest) my problem is I have no way to communicate with him nor have I ever been to his place or no where it is he know where I live and come here all the time to pick or drop them off. what do I do I'm tired of being nice and him and his family have nothing to do with me or the kids when they are here and I'm always afraid if something happen when the are here with me or when they are with him how would I tell him or find out since these people go out there way to ignored me I have not done anything to them I am nice to them even after the things they have done to me which I will not name. please help me