Is there a sexual tension between me and my friend's boyfriend?

I've noticed lately that he started touching me more often, like my arm, and my hips when he hugs me goodbye, he also put his hand on my leg when we're sitting next to each other, and he always sits so close that our bodies are touching. He even hugged me from behind when we happened to be alone in a room. And he stare into my eyes sometimes, but I'm not sure whether it means anything or not. I know he loves my friend, and if it was one time I wouldn't even pay attention but it happens often. Is it just a friendly behavior? Or he's sexually attracted to me?
Is there a sexual tension between me and my friend's boyfriend?
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