1.I'm really head over heels for you, and I care a lot about you.
2.I'm so deeply in love with you, and I value and cherish you more than anything.
3.My feelings for you are sincere and true, and I'm always thinking of you.
4.You mean the absolute world to me and I'd do anything for you.
5.I adore you from the bottom of my heart, and your wellbeing is my top priority.