Not the wicked stepmother

Sorry this is long, but i need help.

Ok. So my husband voluntarily sends his ex $160 a week to help support his 6 year old daughter. This isn't court ordered or anything. I personally think it's too much, since she lives with her parents and doesn't pay rent, he also pays for her cell phone bill and car insurance, and there's no way a 6 year old needs $160 a WEEK. That's almost twice the amount the state would require him to send. but I leave it alone and don't say anything, because it's his daughter and his paycheck, so whatever he thinks is best.

Anyways. This month, since it's Christmas, he sent her an extra $400. That was supposed to go to presents! Instead, she won't tell him what she did with it, but she has texted him telling him how pissed she is that he didn't help out at all with his daughter's christmas!! When he sent her a picture of the bank statement saying the money was deposited into her account, she told him it never showed up, so he showed her a screen shot of a previous conversation they had where she said "thank you for the extra cash. I'll make sure to tell her (their kid) some of the presents are from you."

Now she's rubbing it in his face that her new boyfriend is awesome and he's helped her get her daughter presents, which is more than the actual father did. Basically just cutting my husband down, saying he's not a real father to his daughter.

What the fuck??

And that's not where it ends. His daughter won't talk to him. When he calls, on the rare occasion his ex let's him speak to his little one, she talks for maybe 5 min and then tells him goodbye. She won't say "I love you" to him or anything. His ex has completely brainwashed her into thinking he doesn't care for her. It's so painful, seeing him after she hangs up. He's distraught and feels like he's lost her for good. He hasn't been able to see her in a year, since every time he tried, his ex backed out on him, even though he drove 15 hours just to spend a few hours with her. Meanwhile his ex's new boyfriend is left alone with her all the time unsupervised.

We're planning on taking her to court, but that process could take a while before anything changes.

I've put my foot down this time. He's spending a lot of extra money, and I don't believe even half of it is going to his daughter. In her pictures, she's wearing old, worn out clothes, while her mother is constantly posting pics about new outfits and getting her nails done and all of that. So he's cancelling her insurance and sending less money to her. Once we take her to court, he's asking that she has to prove where she's spending the money, and set limits that it only be used for paying bills or buying things that their daughter needs.

He's let her know that he Will no longer be funding her as much, but that he will be continuing to be a part of his daughter's life, whether she likes it or not.

I guess my question is...how do I handle this? It's breaking my heart seeing him go through this, and I don't know what to say. That little girl used to love her daddy. How do I comfort him? Is there anything I can do to help with this process?