Is it bad that I don't say hello to my roommate?

I have a roommate that used to be my best friend. We met our freshman year of college. She didn't really hang out with people when I met her and I sort of brought her out of her shell. We got really close and we got really hyper together and people thought we were sisters or knew each other forever. We were attached at the hip. We met this guy and he was really close to us as well. We met this girl and we kind of became like a tripod...I mean we had other friends, but we hung out a lot together. We just clicked and got along even though we were very different. The girl we met later in the year had this boyfriend type guy that she was not sure if she was going to marry or not. Then came along this Saudi Arabian guy that I went out with and fell in love with. I did my best to manage my time with my friends and boyfriend. That boy that we got close to liked my one friend, but she didn't like him like that. The girl that I met later in the year had a thing with my boyfriend at the time's friend. Meanwhile another one of his friends liked my close friend and she thought she liked him. There was another saudi that liked her as well and she wasnt sure which guy to choose. My other friend and the guy she had a thing with broke up and that night he was with my close friend. she told both guys she didnt like them like that. apparently the guy she was with and the girl that other guy was with said it was ok. I do not like this guy that my old best friend is with. He doesnt treat her right and once she without with him, i never really heard from her anymore. she wouldnt call me or anything. when i went to go visit everyone, she wouldnt pay any attention to me and it seemed like she could care less if i was there or not. our close guy friend hung out with her once during this time and then stopped cuz he saw how she was and he knew that this would happen to us. Well I know this is confusing, but me and this girl are not as close, and we have gotten into many fights, and me and that boy broke up because there was no future for us and our cultures and religions dont mix. this friend is still with his friend and she sorta treats me like idk like i dont matter. she will just come to our aptmt and then get stuff and leave without saying a word. i used to say hello to her when i saw her, but she doesnt make an effort, so i just dont talk to her when she comes in, and its really weird when we talk. she walked into to apartment today and i just looked when she opened the door and didnt say anything. i wanted to say hi but i like lost words. do you think that this is bad that i dont say hello to her. she doesnt say anything to me. i feel like a bad person and a bad friend.