What's the point of putting a period in front of girls?

If you add a sentence, you should analyze the meaning of what he said at this time and what he wrote. Marks generally indicate the end or completion.

If he writes about feelings, then adding a mark in front of them means that he has ended this relationship and has no other fantasies.

If you are talking about a career or success after doing something, you can add a mark to indicate the end.