Dialog spoken to say "I love you" by characters who do not say "I love you".

Woody Allen as Alvy Singer: “I lerve you.”

“Why’d you stay with me?”
“Why do you think?”

“I lesbians you.”

Fred dancing with Ginger (though that’s without dialog) .

“Come, I will have thee, but by this light, I take thee for pity.”

“I would not deny you; but by this good day, I yield upon great persuasion, and partly to save your life, for I was told you were in a consumption.”

“You keep thinking, Butch. That’s what you’re good at.”

Olive juice

“Miluju tebe”

“Mrs. Darcy.”

Although, strictly speaking, he’s only supposed to utter that when he’s “completely, perfectly, and incandescently happy.” But I’m pretty sure it also means “I love you.”

You complete me.

“You always were an asshole, Gorman.”

Admittedly in this case it’s just “I love you for not leaving me to die alone and horribly”, but still.

House and Cuddy playing Scrabble.

Cuddy is upset because while she’s said, “I love you,” House has not returned the words.

House shows her his tiles, which say, “I LOB YOU.”

House explains that was the best he could do with the letters he had.
~VOW