Why does leonardo dicaprio always die in the romantic movies he stars in?

thanks for ruining The Great Gatsby for me, out of all the romance movies you had to pick and spoil that one...... anyways some people say it's because he doesn't want his character to survive for any plausible sequels (although that theory goes out the door with titanic and R+J) however others say that his face structure is fit for tragic characters so he would be cast for films which required a youthful charming male to play characters which met tragic ends and even though he's not a "youth" anymore, this theory is strong since he is still cast for such roles continuously. (PS: haven't seen Django Unchained and there's a strong chance he might have died there, don't spoil that either please)

hes a terrible actor