Spiderman 3

[Zweihander]

Uhhhh...

Originally Posted by www.ruinedendings.com

MJ decides not to marry Jameson's son and runs to Peter's apartment. She then tells Peter that she wants to be with him instead and they seal the deal with a kiss. They then hear the sound of sirens outside and she watches as he swings off into the sunset, knowing full well what she's gotten herself into.

The whole point of it was that while Peter could want her not to get hurt from his being Spiderman, the choice is really up to her. No matter how much Pete wanted to protect her from... himself, he could do nothing except let her choose her own fate. And she choose Peter.