There is a ton of them.
My choice ones are:
1. I can't stop thinking about you.
2. You're always on my mind.
3. The thought of you brightens my day.
4. Just the thought of you brings smiles to my face.
5. I dream of you in my every waking hour.
6. I dream of you day and night, Monday to Sunday, eyes open and eyes close, every moment and every instant.
