TWO FRIENDSTEN SUMMER TRIPSTHEIR LAST CHANCE TO FALL IN LOVE 12 SUMMERS AGO: Poppy and Alex meet. They hate each other, and are pretty confident they’ll never speak again. 11 SUMMERS AGO: They’re forced to share a ride home from college and by the end of it a friendship is formed. And a pact: every year, one vacation together. 10 SUMMERS AGO: Alex discovers his fear of flying on the way to Vancouver. Poppy holds his hand the whole way. 7 SUMMERS AGO: They get far too drunk and narrowly avoid getting matching tattoos in New Orleans. 2 SUMMERS AGO: It all goes wrong. THIS SUMMER: Poppy asks Alex to…