Family help: Does this seem too sudden that he acted this way with h - Help.com

Does this seem too sudden that he acted this way with her?

This is just an update to the question:

” A guy who knows a girl for a while, share the same social club. The guy always sits directly in front of the girl at the club meeting for years. then over time, the guy sits to the side rows away from the girl. But during that time, he seems to be looking at the girl with still peripheral vision. She starts to do the same to him. then, he decides to move to rows not in her view more to the side and behind. From that view, she cannot see him, but he can see her. He seems to hate her. but talks to her normally. With other people, he is a different person. Is the interaction a bit strange? “

UPDATE: a day ago, the man did a 180. Right before our club session started, I saw the girl sitting in her usual spot, and two of her friends (males), was chatting with her. then suddenly, he walk from over where he started to sit lately; came over to them and basically cut in between the two standing men; flung his jacket over the end chair in front of her; and said some type of greeting to all three. At that time one of the friend walked off at which the other started to ask her a question. He sort of interrupted the friend to say something to her, she replied with a forced half smile. Then she seemed to remember something and took a piece of paper from her purse to give him, at which her asked her a question. she answered him (while he glared). He then walked of to the back of the room. then conversation resumed with the standing friend that asked her a question that her interrupted. later as she was till sitting, his wife came to sit in the seat directly in front of the girl (the girl saved her end seat for her friend who had not come yet). She and the wife started to chat. hen the guy came and sat at the end seat beside his wife. then they both whispered something to each other and began to laugh and the wife bounced her body on him while laughing hard. at which he, while laughing, turned to look in disbelief at the wife. I saw the girl smiling too while watching them. When the meeting recessed, then guy got up and left hid belonging on the seats in front of the girl, while the wife left with all her belongings. The girl stayed and kept staring at his things in the seats.
I know this is strange, maybe a bit redundant, but can I get some more opinions on what you make of the situation? (Something about their interaction seemed fake)