When Romeo and Juliet died
Ttitanic - when Jack drowns by giving up his life for love.
In the 1998 movie Stepmom, where Susan Sarandon calls in her son and daughter into her room in turn and then gifts them what would be her last Christmas presents, since she has been diagnosed with terminal lymphoma. I am moved to tears every time I watch it.
When Romeo and Juliet died :(
The saddest scene in the movie Titanic, when the ship splits into two and and people step on the other side.
Jack falls down into sea the leaving his beloved one.