What does it mean when a guy wants to sit on the same side of the booth?

My married boss took me out to lunch and insisted that I sit next to him on the same side of the booth when I went to sit across from him. When we were talking, he rested his arm along the top of the booth towards me. He didn't put his arm around me but it was along the top of the booth behind my back.
What does it mean when a guy wants to sit on the same side of the booth?
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