Why would my boyfriend distance himself from pda but 2 minutes later plant himself between me and a guy chatting me up?

If he wants me to be known as taken, why not accept my minor pda?

If it helps, we were at a rock climbing gym with mostly guys and his best friend when he was distancing himself from my closeness (like just physically having our arms touching.)
Why would my boyfriend distance himself from pda but 2 minutes later plant himself between me and a guy chatting me up?
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