Here's a romantic marriage proposal message:

you are the sunshine that brightens up my day and the stars that light up my night. You are the rhythm that makes my heart sing and the melody that makes my soul soar. You are the missing piece that makes me whole.

Will you marry me? Let's create a beautiful life together, filled with love, laughter, and adventure. I promise to always cherish, support, and adore you.
Remember, the most important thing is to speak from your heart and express your true feelings!