Is it normal for a boy to say he's nervous around me, and "doesn't know why"?

So Im gonna explain this real quick. I am in a professional swimming team and my friends (the team) and I stay and talk and play games I was left alone with him he pretty much avoided "skin" contact if my knees bumped with his he would get nervous and scoot a bit when we go a team cheer and we put our hands together mine and his were pretty close.

So basically we were left alone he made funny facial expressions and laughed and I asked him why, he said he left nervous and I asked again and he said I don't know he wanted me to make conversation to make him less nervous he talked about his family asked me questions and it was a normal convo but there was this mood that he was still nervous.

Is it normal for a boy to say he's nervous around me, and "doesn't know why"?
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