1) I'm crazy about you
2) I'm in love with you
3) I've got feelings for you
4) I care about you
5) I've fallen for you
6) I adore you
7) You turn me on
8) I'm head over heels for you
9) You are the one for me
10) You're the love of my life
11) You're my everything
12) You're my other half