First HS boyfriend...we dated for a while then I found he was cheating on me with someone so we broke up. IT was a relatively short-term thing so not a crushing heartbreak. About a year later he came to me telling me he made a terribl mistake and that he wanted us to try again. I told him I knew he made a terrible mistake and that there was no way in heck that we would be trying again.I think my exact words were "What happened? Did the sknk break up with you?". That pretty much gave him the ida that there woul dbe no "trying again".
Second HS boyfriend. Nice kid. Liked him. He found someone he liked better so boke up with me to be with her. He ended up marrying her, and they're probably married like 30 years, so obviously he was right.

However, he was a little harder to get over. It was hard seeing him day in and day out at school.
Third HS boyfriend...we were on and off for Senior year. He wnt aay to college and it sort of fizzled out. I hear he's some bigwig in the stock market living in London.
First serious adult romance. Very difficult at the break up. He was one I thought I could marry. I didn't date for a long time after him...just enjoyed hanging with my friends, travelling, no ties.
Then I met DH

. I've known him 25 years, married 22 years. Best thing that ever happened to me and the lessons I learned from previous boyfriends made me see why he was perfect for me.
I will say that after break-ups, even as a kid, I always took some time to think things through, figure things out, look back on the relationship & learn the lessons. I wasn't one to jump right into another relationship.
My opinion is that a break-up is like a death in some ways, because it is the death of a relationship. So the relationship must be mourned for a period of time. Mourned in a healthy way, but mourned nonetheless. MOurned, dissected, thought about.
The best thing your DD can do is keep busy. If she works, tell her to try and pick up some extra shifts. Try and keep her busy around the house a bit if she doesn't work. Encourage her to do things with her friends...tell her to invite them over to hang out etc. The worst thing is to sit in the house alone pining away.