Why did he put his hand on my arm and not shake my hand?

I gave my friend a Christmas Card saying To The One I Love on it. I asked him did he like it and he said to me, "Yeah I really liked it. Thank you very much". Later he shook hands with all the people I was with but he didn't shake my hand and he just put his hand on my arm and then I put my hand on his arm too. He didn't shake my hand.
Why did he put his hand on my arm and not shake my hand?
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