Personally, I'm not convinced the boyfriend is the problem for any of these girls. We know nothing about the contracts these girls sign, so for all we know the girls are not obligated to do anything more than just live their lives. In my opinion, and probably not shared by many others, Jasmin does not get involved with the others because that's just who she is, less of an extroverted character, and she's just living her daily life. The funny thing is that Jasmin is the most 'Real' of any of these three girls, because I don't think she's altering her personality at all having come into the apartment