Why does he put his hand on my lower back?

this guy i have been seeing has this funny habit of putting his hand very low on my back when we are just walking in public. I don't know if this is romantic, lustful or possessive because it makes me uncomfortable how low the hand placement is (right above my butt) any thoughts or am i being weird? this is only our second date and i want to take it slow.

Why does he put his hand on my lower back?
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