The glimpses you are experiencing can be breadcrumbing. It is meant to get you confused and keep you in the loop in a relationship. You are lucky that your kids know you are the good parent here.Sometimes the other parent successfully paints the good parent as being the bad one .In those scenarios kids can't get any help from good parent as they believe the smear campaign and stay away from the good one.Here your kids will be better off with you. Hang in there.