I've seen a lot of similar situations where one part in the relationship (usually the woman but not always) wants more tokens of established relationship than the other. They also tend to use terms like "my boyfriend" instead of the boyfriend's name in conversation to drive home the fact that they indeed do have one of those fancy 'boyfriend' thingys and that they are In A Relationship. Being in a relationship is higher status than being a pathetic loser single, and living together with someone is another step up on the ladder.
How are things looking from her perspective? Are her old friends from highschool getting married and having kids? Are her parents asking her when she's going to settle down with someone? Not that I condone her behaviour, but peer pressure can be a mean thing. If you want to work a little on your relationship, this is an angle you could investigate.
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