ok i am thinking two scenarios,
1.phil is not a nice person if you get to know him like the girl get to know him by staying 24 hours a day, becouse the one we thought might like him was sonya even she use to go out day and night may be that was to avoid him and when she came back to give it a go but she could not so may be she tald vv to leave they came up with the idea she should move with ivo since she liked him.
2.all this is stage to create another group like ivo sonya and petra, so they fight she move with messa and nastya, that way they cram another person to the apartment,because it does not make sense to she is going to their room specialy if they are a couple instead of the sofa and the girls making out just to make it natural.