亲爱的爱上你是我今生最大的幸福

一楼真听话,这也帮着译

It's the happiest thing in my life to love you,my dear.If i had been seventeen years old,i still choose to love you but leave away.(个人翻译，供参考)

英文：
My darling,fall in love with you is the happiste thing in my life.If l have the age of 17 once more,I'll still love you.But I'll still leave you ,too.

西班牙语：
Mi amor,te amo mucho,que es la felicidad mia en la vida.Si yo tuviera otra vida con 17,te habría amado igualmente.Pero te saliré otra vez tambien

Dear, I fell in love with you the greatest happiness of this life, if there is a 17-year-old, I still choose to love you. But my dear I will choose to leave you.