What does it mean to have a full stop when chatting between couples?

There are many possibilities. First of all, who will stop, boys and girls?

Boys: 1. This chat is over (perfunctory)! 2. How should I reply to her (or be a little perfunctory)? 3. speechless 3. 4. Change the topic and avoid awkward chatting (a new practice) 5. Be naughty.

Girl: 1. Too lazy to chat with you, I slipped away (more perfunctory than the boy's 1, because most girls attach great importance to the relationship between lovers, and if they don't, they may break up). 2. The same boy (2)3. The same boy (4)4. The same boy (5)