My boyfriend introduced me to his friend?

We were standing waiting to my bus
His friend came closer, passing by
And he intorudeced me to him and the friend goes..."you already introduced me to her"
I smiled and shaked his extended hand anyways...
But it was very awkward
And I didn't get what was the need to introduce me again
Then my bus came and my boyfriend asked that guy where he is going and said he will go with him

I got into bus and me boyfriend and his friend left

Why he does? Its his second friend and sexond time he introduces me to him twice

My boyfriend introduced me to his friend?
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