When a guy playfully kicks your butt in public?

We have had sex. Once. We still hang out and talk all the time but it has never been mentioned to have sex again... I went for a run with him the other day and I made a joke and he playfully kicked my bum, I liked it, and it was in front of his work colleagues. Does that mean anything or am I reading into it to much
When a guy playfully kicks your butt in public?
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