What a hard day

I have spent more time crying today than I have in a long time. When do you know when its enough? When you have given enough? When you are trying hard enough? All I know if I feel like I am killing myself for the kids that I watch and trying to make good decisions for their benefit. Unfortunately, they dont feel the same. I had a falling out with one parent and its triggered another to pull their children. I understand this as they are related. What I dont understand is why people feel the need to be cruel about it. Their kids have been coming to my house for a year and all has been well as far as I knew. Then I hear that the kids dont feel safe or happy here and havent for a long time. What the heck? First of all, why wasnt I notified when this began, and secondly, why rather than trying to work things out, are they just pulling their kids out with no notice? Frustrating. Bah, I wonder if I just need to pull emotion out of this and think of it as a business transaction. Feeling like a piece of crap tonight.