I've missed you
I've missed you so much.
No sabes cómo te he extrañado.
You have no idea how much I've missed you.
— Cuestión De Honor (1992)
Si supieras, querida, lo mucho que te he extrañado.
If you only knew, my dear, how much I've missed you.
— Ирония судьбы, или С легким паром! (1976)
I've missed you.