Was he flaunting his girlfriend?

A guy in my class and I were crushing on each other really heavy but none of us knew of the other's feelings at the time. He had asked one of my male friends if I was taken and the guy lied and said yes. They became rivals.( I discovered this some years later) After obviously not acting on the mutual crush we both moved on and one night some years later, one evening he passed on the sidewalk by my home all hugged up with a girl he was obviously dating. He literally saw me first, but greeted my younger brother who was present also and ignored me completely. He immediately told the girl something out loud concerning a topic he and I would discuss at length back in the day that made it so blatantly obvious that he was trying to flaunt/ show her off. When they were out of sight my brother laughed and began teasing me. What was the guy's intention that day exactly? Is he completely over me? Am I reading too deeply into it?
Was he flaunting his girlfriend?
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