Why won't he touch me?

Why won't he touch me? I have known him for 2 months because of an extra curricular which he invited me too. (He showed up at my door step at my door step and invited me - that's how we met). At the meetings, he would usually sit next to me or near me. He would escort me home if he wasn't busy. We are just friends. At the moment he is away and he left some of his bags with me until he gets back.

So now to back to my question, some of the guys I know are so physical (sometimes its irritating). They always have to give me a hug, stroke my hair etc. But with him, its just a hand shake or a high five. There was one time when I almost fell but I got my balance before he could have helped me (when he saw I got my balance he quickly moved back).

What did I do to make him keep his distance, avoid any physical contact? Is he afraid to touch me or is it some kind of respect?
Why won't he touch me?
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