They say

"I love you."

and it means more 

than just

"I love you."

They say things that aren't

I love you

But they really mean I love you

They say:

I love you*

*I'm so happy when I'm with you

They say

I love you*

*I could talk to you for hours

I love you*

*your smile makes me smile

I love you*

*your laugh makes me laugh

They say:

See you soon!*

*I love you

Can't wait!*

*I love you

They say "I love you."

When they kiss your forhead 

When they think you're sleeping

aka I love you*

*even if you don't notice

I love you*

*even if you can't tell

They say:

I love you*

*I think of you, even when you're not here

Or sometimes they just say:

"I love you."

No asterisk.