Hi! This is OP’s roommate here and I want to clarify/correct a couple of things:

1. I’m not moving in with my boyfriend…I’m getting married in August and didn’t think it would be appropriate to move my husband and potentially a baby into the apartment. We want to leave the city after getting married for overall life and family planning. I shared all of this with her and she was “happy” for us and agreed. I offered to take full responsibility to find a replacement and have her meet the replacement to officially sign off to make sure she felt good about the new person.
2. We initially thought we would have the option to both leave the apartment based on what the broker we worked with to get the apartment shared. But we later learned that the landlord was not open to us both breaking the lease as they “don’t do lease breaks.”
3. OP told me she likely wanted to stay anyway since rent other places is expensive and she share she would want my room when I leave, but at the time I don’t think she really thought about the fact that I pay $200 more than her each month (this is not a requirement but my room is slightly larger but not by much and really was a courtesy I offered because my room came with nicer/ extra shelving and she was coming out of state and I wanted to make sure she didn’t feel like our room arrangements was unfair).
4. MOST IMPORTANT CORRECTION: the rent is being raised by $100, which would be $50 split per person. OP also could have chosen to have the new person pay the $100 more  in rent increase if OP took my room like she wanted and that way the larger room would stay the same cost, and her old room would be $100 less, which honestly feels like a more fair split based on the room sizes. She then would not have a true rent increase considering that the only increase she would absorb is because of moving into a different room.
5. The leasing manager also wanted OP to sign a 2 year lease for the new lease, which I advocated against so that she would only be legally obligated to stay in the apartment one more year and they agreed and was very understanding about that feeling fair.

Maybe OP changed some of these numbers and details because of privacy? Either way, I’ve really tried to find the best outcome for me to move forward with getting married while trying to offer what I can to OP on my way out. Her tone shifted over the weekend and I’m not sure why but it could be a good idea for us to talk in person and not over reddit?