Sorry this happened.

If she wanted you to be honest, she shouldn't have flipped out IMO. She has the right to feel hurt inside, but she doesn't have the right to harass you like that. I personally think she should have accepted the opinion as an opinion and used it as a deciding factor with what to do about her boyfriend. There's no point in asking for an honest opinion if you're not willing to accept something you don't want to hear.

You are not a freak or a weirdo. You are a person with feelings who was trying to do the right thing for her. There is nothing freakish or weird about your help. And I personally don't think anyone can be freakish or a weirdo for fighting, even if you fought for many years.