He does know about it, and is fine with it. They have been in this situation for 3 years, so it's normal for them, which is fine.
The problem in this is me, and I suppose even my culture (I've moved here from Ireland, and honestly never been exposed to this at home)
I am wondering if I can get over the fact that for instance, when she gives me that look, that it's not just for me.
The other thing is, I don't want her to break up with the other guy, as I don't want him to be hurt. And I don't want to change her, because that'snot my game!
So you can see I am deep in a paradox!