I am a bit confused because you started by saying that you are fine with the two roommates, and not with the one who is a she. You explain how she is to you, but then the last sentence you say how they and them use what you say against you. Either way, get out of there. Living with roommates in a campus rental house is not something you want to continue doing once you are out of college. Think about it like this, you graduated from college and you are also graduating from your roommates. If you can only afford to live with roommates then find roommates that have similar values as yourself. Maybe find a rental that features separate living quarters, rather than shared bathrooms and kitchen you get your own if you can afford it. As for what she says, let it go… Who cares unless you find it to be true. You will never have to talk or see her again, so she will have to find someone else to belittle in order to lift herself up. If you let what others say bother you, then to them they have “won.” Some people see life as win/lose and try to figure out who they are beating and in order to make sure they get ahead or bring someone down they use those tactics. Be civil, but if what she says is not true then it requires no response and your brain shouldn’t even register it. This will probably greatly irritate her, but that shouldn’t be your motive your motive should be to get it across to her that you do not care enough of her opinion to listen. And the finale will be you moving out. If you want to be cool with the other roommates tell them that you don’t have a problem with them, but it is time for you to get a new place and that you’d like to keep in touch or don’t, but don’t feel guilty about doing something for yourself when you are in such a situation.