This happened to me a couple of weeks ago.
I went to a concert, a former co-worker was there.
I told him hello and I introduced him to my sister right away. They shook hands, all the formal things.
He was with two girls that were with him but standing back a bit from us.
I mean they were within earshot, so I thought it was weird he didn't acknowledge them. I addressed it by asking if he came alone.
Then he said 'No, I came with my friends.' He pointed to the girls, and they looked up from their phones and smiled.
I think one of his 'friends' is his girlfriend.
erplexed
So we were standing there talking for like 4 minutes. His girlfriend, tapped him and told him they were going to the toilets. He was just like, 'yeah okay'.
Then we started talking even longer.
Then he gave me a sweaty hug. I liked it.