Husband shows little affection

I need help. I’ve had this talk with him so often that I just sound like a broken record.

I have a six y/o daughter that he’s raised since she was 7 m/o. He’s not a very affectionate person per se, all thanks to his wonderful mother and the way she raised her kids, never hugging them or telling them she loved them. I get why he’s more reserved. However, he just outright rejects any affection my dd throws his way. He’s always said that she’s HIS daughter, both to me privately and to other people, but it’s almost like he can’t bring himself to be physically affectionate. He jokes with her, tucks her in at night and whatnot, but hugging? Saying he loves her? THAT he has literally NEVER said to her. I know that people show their love in different ways, I’m not a lovey dovey person myself, but him...it’s so obvious that my mother, who never meddles, never steps outta line, never puts her nose where it doesn’t belong, actually said to me today that she has noticed that he says hi to the dog before he says hi to dd. She gets so excited when he gets home from work, too. Always yells “Daddy!” And just runs to him, but gets ZERO response from him.

I don’t know what to do. I’ve talked to him, written letters, calmly explained, not so calmly explained, and nothing. Ladies, help. I’m heartbroken and at my wits end.