I also give my trust slowly, and when faced with betrayal, I quickly withdraw it.
I had a friend, one I had known for several years, who betrayed me just when I needed her most. We were different in some ways, and I respected our differences; I thought she did too. Suddenly, she disappointed me, and I found out about her actions from third parties. That's when everything broke down, and I cut her out of my life forever. It was very hard; I cried a lot, but she didn't deserve my trust or my friendship.
Thanks the way to do it; untrustworthy people need to be cut away like the cancer they are.
She no longer exists for me. She hurt me deeply and claimed to be my friend. Get out!