Reading the other comments it sounds like this might be a healthy relationship.
Idk if this is my own baggage talking but the only thing that comes to mind is has he been married before and how did that turn out?
If he marries women and divorces them and leaves them in a bad situation, then I guess she should be ready for him to do the same to her eventually. I wouldn’t suggest she go asking a lot of questions in a short period of time because I feel like this stuff comes out naturally over time but as she learns about it she should be aware of it and be prepared. (Do things like save money, get a degree or some other means of being able to support herself just in case shit happens.) I know people change, but I also know people don’t and can keep the same behavior from relationship to relationship.
Don’t take so seriously and you can never out exercise a bad diet.