Depends why the girl is "lost." But usually it is just because things don't work out, etc, etc. With that in mind, what helped is that time always moves on. Nothing stops and as much as I'd like to make it stop, I can't. Only thing I can do is to keep moving forward and do whatever I can to move on. Never stop moving in the right direction. With that attitude, it has always helped me.
Expectation vs Reality.