I saw this movie Around the mid to late 80's. I think it start with a couple of teenagers that go to girls and boys schools , they meet at a dance and start secretly meeting each other in an old cemetery? Something happens during all this and they end up running away and living in the woods?

Might be Fire with Fire (http://www.imdb.com/title/tt0091053/)

Omg that is it! Saw this movie when I was 8-10 years old.. Was the first " grown up" love story I ever watched! Have been wondering what that movie was for 20 years! Thank you ;)

Glad to help.