I am done raising kids and my boyfriend just got custody of 6yr old granddaughter. Do I stay or leave?

You say nothing about the state of your marriage before or after getting custody of the granddaughter.If you are truly thinking about leaving just because your husband got custody of his grandchild then they maybe better off without you. I know it will be a whole different life but this is a child we are taking about.What if this was YOUR grandchild and your husband were saying these things.How would you feel? What would you tell him??? That should answer you question.