Why is he acting creepy, but when I try to talk to him, he leaves or do not respond?

Anonymous

This guy I know from university is acting strange. He would stare at me across the corridor and would stop when I catch him (it has happened multiple times). I ignored it because I thought that it is not harming, so why create a fuss.

But then one day I was finding my wallet in my backpack. He was standing really far and his friend (just say her name is Sara) was standing close to me. Both of them were having some loud conversation, some classfellow bumped me, and I lost my balance. I thought I bumped into Sara, but it was him.

He placed his arm on my upper back, I instantly apologized because it was my fault.

Now, he brushes past me multiple times. He would rub his shoulder against mine while walking past me.

Once, I was sitting on a chair in class and he rubbed his thigh against my arm.

Then, one day I was talking to my friend and my hand was at the top rail of my chair, he went to sit in the seat behind me. While doing that, he turned and touched his bum to my hand. He acted as if nothing happened.

One time I was sitting in the corner, and he somehow touched his body against my back. My whole group saw and was shocked and he acted as if there was not much space, and it was an accident.

We are also placed in the same lab group by my professor. He is in the good books of almost all the professors. He does nothing, and does not talk at all, he would just use his phone, and I was Okay with it as long as he was not bumping into me. Now I am extremely careful, even if I see him from afar, I ensure that I'm in a safe area.

With time the lab work was too much for me so told him that he should do his part in the lab. He did not reply to that, but started helping. Now, I can feel that he is still trying to accidentally touch me because his walk is so clumsy. He has tried two or three times but failed.

He has a lot of female friends, and he does not treat them this way. I don't know why he does it

Why is he acting creepy, but when I try to talk to him, he leaves or do not respond?
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