Girlfriend's flatmate doesn't have boundaries?

I was over at her place last night. We've only been official recently.

Her flatmate made her feel really uncomfortable by literally asking me, in front of my girlfriend, if I wanted a back massage. Which I refused vehemently.

Her flatmate knows about us, knows how I feel about my girlfriend and how she feels about me.

I really hate homewreckers

Girlfriend's flatmate doesn't have boundaries?
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