What should I do if I like my crush but also scared of him?

I think my crush likes me back, he follows me, he swerves his bike infront of me, I saw him staring at me, he talked to his friend about me and he’s always sitting by the bus stop near my building. He would ride his bike from one destination to another just to pass by me. We talked a year ago and exchanged numbers. He was nice but he would growl at people walking pass like signaling them to go away. The problem is I see him checking out girls sometimes and talking to them, but when I’m in his presence he focuses on me. We don’t talk anymore I don't know why I guess because he doesn’t recognize me from a year ago but he still tries to make sure I’m the same person. I’m scared of him because he talks to himself, he seems to have mental health issues or he’s on drugs. As once he stared at me and his face was horrifying, his eyes were so big possibly front drug effect. I also saw him keying a car. I think he might be crazy. What can I do?

What should I do if I like my crush but also scared of him?
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