Not that it matters terribly, but I am confused about the timeline implied by a three-year relationship seven years ago. Did the daughter have a relationship that started when she was 19 and was (mostly) broken off when she was 22, or a relationship that started when she was 16 and was (mostly) broken off when she was 19? It seems kind of different. But I wouldn't personally call the first example "seven years ago" if it ended only four years ago.

The pattern I am seeing (and it may or may not be a real one, as the letter isn't so much to go on) is that both of them are doing this thing where they break up with a partner and then go back to them, and they're also kind of doing this with each other.