<human>: My roommate of two years is talking trash about me. When it was our freshman year, she started to date my older brothers best friend. She knew my relationship with him and didn't tell me until they were both drunk, barged into our room with half their clothes were gone, the night before my midterm exam, and told me. Since then, she's never been home and when her parents came to visit, she said that all the mess was my stuff, which I was fine with. Then her mom keeps calling me and asks where she is and my roommate told me to always tell her that she is off on a run or something (she never runs). 
That summer, it was my birthday. She drove all the way down to "celebrate" aka spend ten minutes with me and spend the whole weekend with her boyfriend. She overslept and her mom called me asking where she was and I told her that I have no clue since I was at work. My roommate got mad at me for that because I didn't say that she was at my apartment sleeping or something. 
The following year, I'm living in a 2 bedroom apartment and she has been home for the night a total of 7 times the whole year. 3 of those times have been because her and her boyfriend broke up and she needed a place to stay. 
Now, my brother texted me saying that my roommate is talking smack about me and the boyfriend, my brothers best friend, is doing nothing about it. My brother said that when he and the boyfriend talked, the boyfriend said that he was in the relationship because her family was rich and she will do anything he tells her to do. I just had to get this off my chest, so thanks for reading, reddit!

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: roommate and her boyfriend (my brothers best friend) have been talking trash about me after I have done so much for them.