Should I believe her anymore?

I have these friends, Fred, Andrew, and Molley. I only talk to Fred by ims and no him from Andrew. I kinda like Fred, too. Andrew and Molley live near each other. So one weekend Fred went to Andrews. Molley, Fred, and Andrew were together. Molley told them that I said Andrew was the biggest dork ever, that i was using him to get to Fred, that i thought Fred had a nice , and stuff like that. Andrew imed me cusing at me and all. Fred got on and said that Andrew was mad at me and all. So i talked to both of them and they said they believed me. Fred asked her why she said those things when i never said them. She said the dork was true was a lie and using him was an opinion. Shes lied before and i was about me and Fred. She nos I really like him but we dont no why she would make any of this up. She says she doesnt like him either. So she i tell her stuff? Believe anything she says???