Am I crazy?

Madison
Okay so there is this guy that I almost dated last year, it lasted about 4 months before we just stayed friends. I liked him he liked me it just wouldn't have worked. 
My now best friend who didn't know him when we were talking is now interested in him. She knows what happened and how we liked each other and now they are "talking" 
Im a little upset with her because I don't think that's right. I understand you can't control your feelings for someone but what bothered me is she didn't even ask me. Is that wrong of me to be upset that she didn't ask me how I felt about it? I don't like the guy anymore but I've never done that to a friend...  She's met him once and now they text all the time. 
She's also dated one of my exes but that was before her and I got close. 
 
I don't know what to do