Just I see myself as the partner of my GF, not her jailor, daddy, owner or white knight that has to save her all the time from herself. Nor do I have the time, inclination and energy to watch over her 24/7 even if I wanted to (and no getting us both into a gambling debt of EUR 100.000 I would also see as not taking care of herself or us

, it is not just about sex).
She has a brain and is quite capable of taking care of herself and I do expect her to use it and if she really prefers to be with someone else, well even if it sucks that is her good right just as long as she is open about it and does not try to keep me as well and eat her cake and have it.