Why is he running from me?

I like this guy in my gym.. He used to look at me from afar a lot.. We even used to exchange smiles and say hi.. He is not very regular at the gym due to his studies.. He came back after 20 days, he smiled at me and did the same.. Observing me from afar.. I tried to ignore him that day and I was also irritated so I had a frustrated look on my face.. The next day he completely ignored me didn't even smile at me.. After 2 days, I went upto him and said hi, he replied and smiled a little.. Just after that, when he went away even I was about to leave he just ran away in the other direction seeing me whereas he was very comfortably talking to my friend, he told her that he has a lot of stress due to career when she asked him that why does he hardly comes to the gym.. Why did he do so?

Why is he running from me?
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