I love you but I can't have you

Piper and Sam have been dating since freshman year of high school and everyone thought that they would be married and have children together and even there best friends and piper her self thought so but after a year an a half after high school and after Sam goes to Canada with his uncle and best friend Colby and meets a girl what will happen to Piper and Sam's relationship? will they still be the perfect couple? or will sam move on? find out in I love you but I can't have you.