The Triangle:
Socialite Rose DeWitt Bukater (Kate Winslet), fiancé Cal Hockley (Billy Zane), and amateur artist/Riverdance fan Jack Dawson (Leonardo DiCaprio), all aboard for the RMS Titanic’s maiden voyage. 

Does It Get Complicated?
Cal’s got cash... but he’s such a prick that Jack easily floats the boat of the bohemian, Picasso-lovin’ Rose.

Pity about that iceberg, mind.  It’s hard to keep a hot romance going when you’re wading waist-deep in freezing Atlantic water.

Jack drowns (sob), while Cal – bullying his way onto a lifeboat – survives (boo).  At least Rose has the good taste not to go back to him.