DP and I have been dating for a little less than a year now, and we've been talking about moving in together. She'd be moving into my place since it's literally right across the street from her place of work. Thus far, the only other person I've ever had living with me was my ex boyfriend who paid half the rent. That's not quite possible with DP now though, given her salary. She's also said that in the past, none of her ex-girlfriends charged rent since they'd be paying the same if they were living alone anyway. That doesn't sound fair though, does it?
What's the so-called norm when it comes to something like this?