Read this a long time ago and can't remember author or title...high school couple cheat on each other, later finding out they were drugged. Male mc gets into argument with dad and leaves town, ends up in Montana? where he starts working on a ranch? for a widow w/daughter, ends up marrying widow who dies, and male mc ends up reuniting with ex high school gf and the mc, "adopted" daughter and ex live on ranch.
Iirc adopted daughter has a dream about the ex becoming her new mom?
Tia, SunSeeker