Самой лучшей женщине в мире:
Хочу, чтобы ты была счастлива. И я все для этого сделаю!
Не грусти никогда. Я вместе с тобой.
Когда горят твои глаза и на лице улыбка - я счастлив.
Ты- это безумное желание жить! Я знаю: ты та, которая моя

Заранее спасибо

I want to see you happy and I'll give my best for you
you've got me here beside you. there's no need to feel blue
I am a happy man when I see you smile and shine
you are my lust for life. I know you're meant to be mine

Sounds like the proposal words for me.
Ну, вот вам еще, выбирайте
*I can't imagine growing old with anyone else, nor do I want to.
*I know you're the only one I want to share the rest of my life with.
*The story of our love is only beginning. Let's write our own happy ending.
*There are many ways to be happy in this life, but all I really need is you.
*When I look into your eyes, I can see a reflection of the two of us and the life I hope we'll share together.
*I know my life will never be complete without you beside me to share it.
*When I look into my heart, I see only you. If you can look into your heart and only see me, then we should spend the rest of our lives together.
*Let's put our hearts into each other's hands for life.
*I promise you, no one will work harder to make you happy or cherish you more than me.
*When I think about you, I know that no one else will ever hold my heart the way you do.
*Let's make a plan. Ten years from tonight, we'll tell our children the story of how I proposed to you.
*When I think of the future, I like to picture us as two trees planted side-by-side, our roots growing togther more firmly as the years go by, and our children sprouting like seedlings around us.
*Life offers many challenges. I know I can meet them if you're willing to face them with me.
*I believe that if we're lucky enough to have found each other in the first place, we're worth betting on for life. Will you take that gamble with me?
*When I met you, I knew I'd met my match. It was only a matter of time until we arrived at this moment. How it turns out is all in your hands.
*You deserve the very best, someone who will back you up without limits, let you grow without borders, and love you without end. Will you let me be the one?"
*My heart was a desert until you came and watered it with you love. Let's spend the rest of our lives together pulling the weeds and enjoying the blossoms.

После этого она должна сказать:
I can't think of anything I want to do more than spend the rest of my life with you.
:)
good luck