Roommate moved his S/O in out of the blue?
Hi all! I've been living in a 3-bedroom apartment since July of 2018 with two roommates. One of those roommates texted me last night to let me know that his girlfriend will be living with us for the remainder of our one year leasing term - apparently effective for several days already. When I responded that a four-way rent split sounded good to me, he told me they would not be paying any additional rent (but were planning to split utilities four ways).
I contacted my other roommate earlier today to get his opinion on the situation and figure out how to best move forward, and roommate #2 responded that he doesn't have a problem with the situation as it stands. He thinks it's something that only concerns him and #1, as those three spend significantly more time at home occupying the living space (they're both undergrad students). #2 also seems to think that I should either cede the master bedroom (where I sleep) to the new couple, or start paying a larger share of rent to reflect the larger room I live in. I get the impression that #2 was aware of the move-in situation beforehand and I'm the last to know, as well as being the last to know about the unrest with my being in the master bedroom.
What are my options here? Should I aggressively push for a 4-way rent split? Is this something I should immediately go to my leasing office about? For the last half year or so there's never been any discussion initiated (or hinted at) about weighting my rent to reflect my larger bedroom. I want to be as reasonable as possible with these guys, but having #1 move his s/o in and let me know after the fact has left a really sour taste in my mouth. This is compounded by #2 indicating that he had prior knowledge of both the move and the new interest in my master bedroom that move generated.
How should I proceed?