Was the manager right or was he unprofessional about handling a situation?

I had to report someone at work because she conitniued to harras me and made a threatening remark. The .manager told me because of how serious this is, this has to remain a confidential matter. I pulled her aside and asked her if she made the threats and she said no. If this was such a confidential matter why would he pull her aside and tell her about the situation? After the issue was talked over I notice the coworkers friend always coming on to my floor and I thought she was spying on me to try and get me in trouble. So I brought it up to my manager but the other manager interfered and told me that he feels that I am turning the problem into something more bigger than it is, and that he feels I am just knit picking and am basically doing it on purpose to get people in trouble. Now the girl who I felt was spying on me was really on my floor because the managers wanted to keep her busy, and that it has nothing to do with that. But, I just find it hard to believe because why would the girl make the comment about not seeing me on my floor when she did see me on my floor? Do I sound paranoid or is it just a crappy place to work? The place I work at is a very shady place, and the women I am speaking of are cruel and everyone has complained about the and no action had been taking against them. And the managers even told me the employees treat them rudely and they do nothing about it. I felt stupid after that and feel like crap now. I don't even want to go back to work after that.