1. "I have fallen in love with you and I can't imagine a life without you."

2. "You are the love of my life, and I want to spend every moment with you."

3. "I have never felt so complete until I met you, and I can't wait to share my future with you."

4. "My heart belongs to you, and I am willing to go to any length to make you happy."

5. "I have been searching for someone like you, and now that I've found you, I don't want to let go."

6. "You are the only one who has ever made me feel truly alive, and I want to be with you forever."

7. "I don't know what I would do without you in my life, and I want to make sure you feel the same way about me."

8. "You are my dream come true, and I can't wait to see where our love will take us."

9. "Every time I look at you, I fall deeper in love, and I can't wait to see what the future holds for us."

10. "You are my perfect match, and I want to spend the rest of my days proving it to you."

Remember, the sincerity of your feelings is what truly matters, so even if you don't use these exact phrases, expressing your unique emotions in your own words can be incredibly powerful.