Killer?

Have you ever had a gut feeling that wont go away? makes you sick thinking about it? Keeps you up at night? Well I have loads. But this one, has been bugging me for a few days now. This person i knew, went by Rose. Rose was one of my closest friends, i told her EVERYTHING. She even knew my deepest, darkest, secret. One day, rose left for vacation, and along came her sister, Sophia, Who told me Rose Lied. About everything. Her Name, Age, Miscarriage, and Just About everything else. I told Sophia i wouldn't tell. But, I have a huge mouth, and it slipped. i told the person who rose had been E-dating. He was furious, but glad i told him. He then also promised not to tell, and we were going to act as if we didn't know a thing, like Sophia wanted. Rose told me when she was coming back, and about a week after that date passed, i asked Sophia, "Did Rose Quit Habbo?" Etc. Sophia replied that rose wasn't returning. So, i told her E-Bf, Feeling as if he should know. A week or so later, after word had gotten out to just about the whole place, Rose returned. I was shocked to be honest, and after having a shitty day already, i began to question her. Asking why she lied to everyone. Rose being rose, kept up the act, and denied it all, Even Sophia  turned against me, and went along with it. Blah Blah Blah, Shit went down. I was accused of not trusting her, etc. I find that insane because all i was doing was TRUSTING Sophia, But yet i STILL get lectured about that. I tried to cover my emotions, But i somewhat failed. I didn't know who to trust, or what to do. Rose pleaded, Sophia Pleaded, for me to make things right. Tell everyone rose didn't lie, and i was wrong. But i didn't. I didn't believe her. Weeks passed, then came the letter. Rose killed herself. I was shocked, and to be honest, i cried. I panicked. It was my fault after all, wasn't it? I could have fixed everything, made a difference, but did i? No. Crazy part is, there was a day a while back where i was so worked up, and i honestly had the small thought of the famous way out. But rose told me "Dont. I have lost too many people that way, and i cant loose you." Yet, she did.  I was really worked up about it, even though i was reassured the letter was fake. "Thats how she writes!" "I study this stuff, its a fake" "Its not your fault!" "Its CLEARLY Fake." They told me, and for a while, i believed them. Im still not sure if i do or not, its just too much trusting for me. Hell, I even looked up the death records from where she was from. No "Rosemary" Listed. I think its a fake, i hope will all my heart it was, but i still have that small voice in my head screaming, "Killer! Your a heartless monster!" But at the same time there is another voice, questioning "How do you know she isn't just messing with you? Doing mind games? Pulling your strings like a puppeteer?" And a third voice, who basicly agrees with the second by saying "All you did was trust Sophia the first time, they can't yell at you for not trusting them, when they are giving contradicting information!" And i just cant shake them. Now, I know after you read this, you probably wont want to hang out with me anymore, or talk to me, whatever. The truth needs to be unleashed. For its never good to Keep a wild loin in a cage, right? Anyway, i would LOVE any advice. ANYTHING. Hate me all you wish. But this is it. The truth.