On the child thing, my partner and I got together 5 years ago. We already knew each other as friends and our children were late teens - early 20s at the time so we all met fairly quickly.
It's right that he prioritises his child but if you want a relationship with this man that is more 'family' oriented, which I would imagine happening if you lived together, you will also need to know each other. I mean, his daughter would presumably want to visit him at home where he would live with you?
Personally, I wouldn't see a future with a man who was so reluctant to integrate the two most important parts of/people in his life.
For clarity, my partner and I get together with all of our children and their partners probably twice a year and we see each other's children together without our own children there (eg he and I will go out with just his children or just mine) occasionally. But we also see our own children and spend time with them alone because that's inportant.
I think the biggest issue though is the fact he doesn't communicate or talk about his life/life in general, his daughter, his thoughts and feelings, tbh.
What do you talk about when you're together? Because it's a very lonely life living with someone who doesn't communicate! The emotional connection dwindles, the physical connection dwindles as a result and you end up just being two disconnected people who occupy the same space.