My ex broke up with me and not even a day after move on. He didn't want me to know about his new relationship. He has someone but is always in my business and tries to be friends with mine. He always tries to pass me in the hallways and he was outside the bathroom when I was in the bathroom. He walks passed me a lot. Also his friends act weird toward me. If he has a new girlfriend , why is he so worried about me and what I am doing?