Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: So my fiancée, K, and her best friend (female), M, and I were all hanging out at K's house last night (we don't live together), doing wedding planning things. 
For background, fiancee and I have been together for eighteen months, K met M in Preschool when they were only a few months old. 
M made a joke about it being her turn to sleep in with K, since they've been doing it for years, although they haven't seen each other as much lately so sleepovers only happen around once a year.
I immediately said that I would be sleeping in K's bed, since she's my fiancee. 
Fiancee agreed that we would sleep together tonight, but feels like I'm being unreasonable by insisting that we sleep in the same bed and that she not sleep in the same bed as any of her friends whenever I'm there. She says that because she's known M for as long as she has and that if they want to hang out and sleep in the same bed one time a year, I should be fine with it. I'm perfectly fine with them sharing a bed, but I feel pretty hurt that she should choose to share a bed with someone else and leave me to sleep alone in a room ten feet away. 
AITA?

wanting to sleep in the same bed as my fiancée