She can't cope with being alone, a trait of borderline personality disorder. I'm not trying to diagnose her but she displays quite a few symptoms of it (I think it's been brought up on the forum before).She really can’t cope with the idea that people who live together can sometimes go into different parts of the house and watch/do different things in the evenings can she? She seems to have this bizarre idea that all TV programmes must be watched together or not at all. Why can’t she just watch Real Housewives on her own while Phil plays COD? Surely that’s the point of having 2 TVs in the house?
That or she's just fed up of him playing COD every spare minute he has, I remember my ex doing that and it drove me insane.