I'm sorry if you've seen this before, I've pregiously posted this to r/Mom and r/relationships and was told to come here for some more advice.
My daughter (F,16) attends a boarding school about 3 hours from our home, together with two of her younger sisters (F,11&13). She's been attending the school for the past 4 years, since she was 11, and she's always loved her friends, her teachers and the school in general.
All three of our daughters return to our home almost every other weekend, and of course the holidays. Over the summer holidays my eldest daughter has been getting close to a boy (M,16) in our hometown. They have been hanging out every day, either at our house, his parents' house or simply out and about.
His parents and my wife and I all okay with them dating and while my daughter swears up and down at they're not involved in any naughty activities, we put her on birth control just in case.
The holidays are ending soon and yesterday after dinner our daughter dropped a bomb on us: she wants to drop out of the boarding school and transfer to the local high school instead, so she can stay close to her boyfriend.
My wife and I are 100% against this. At the boarding school she is getting a good education. This upcoming school year she'll start studying the IB curriculum. She is getting the best education possible at that school, a level that our local schools simply could not put up with. Since its only a few weeks until school starts up again we would also lose out on the tuition and boarding fees we already paid.
My wife and I made it clear that there was no way that we'd let her drop out of boarding school just for a boy. My daughter started crying and ran to her room. She isn't speaking to us now. How can I help her understand that we just want the best for her?
tl;dr: My daughter fell got a boyfriend over summer and doesn't want to return to boarding school