Because he cut his tie because she tore her veil.
Because he bought the ring one week after they started dating.

Because he never, ever, ever gave up.
Because he wanted to marry her the day he met her.

Because he bought her a house.
Because their children will know that they are soulmates.

Because...

Pam: I'm such a dorky dancer.
Jim: I know. It's very cute.

xxxxxxxxxxxx

Pam: I knew it.
Jim: You did not know it.
Pam: I knew some of it.
Jim: Everybody knew some of it.
Pam: It's Christmas.
Jim: You knew it.
Pam: Thank you. I knew it.
Jim: She knew it.

Because she chose his teapot instead of an ipod.
Because he gave up a chance for a job at corporate to ask her on a date.

Because he risked their friendship to be together.
Because he'll do anything for her.

Because he's never doubted for a second that she's the woman he wants to spend the rest of his life with.

Because of the way she reacted when he came back