I Seriously HATE Him Right Now!!!!

So something happened with my kids, and his mom can get a hold of him, yet he still hasn't called. His mother and I don't exactly have the greatest relationship, but I sent her a text asking to have him call me because something happened with the kids... Still no call. I'm over here balling my eyes out... Why?! They aren't his kids, but he's been here raising them and call him daddy and is they only dad that they know. I can't believe he won't even call me to talk about them. I guess he hates me that much. I just really need him right now and it's killing me. How can he be so cruel and heartless??!! I must be upset I have nothing more to say tonight :'(