What does it mean if a guy keeps touching me?

Anonymous
Just curious, I have this friend who I get on with quite well. We see each other fairly often but we are both in a relationship. Everytime we meet up we have a laugh and a chat and as we are leaving he always makes a point of touching my arm or my back. I'm totally fine with it. But everytime no matter what the situation or where I'm stood he will make a point of touching me to say goodbye. When we are chatting he's been known to touch my leg to get my attention too. I've never noticed him do it to any of our other friends. Could it just be a friendly thing or could it be a subtle 'I like you?'
What does it mean if a guy keeps touching me?
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