The lesson is: fight for love!
Fight until you have nothing left, fight until the last tear, until the last cry, fight with all of yourself until there's hope; use your heart and your brain to reach your goal, because the possibilities are two
1-You'll have your love.
2-You'll have no regrets, because you tried!
In both cases you have done everything possible.
Thank you @rambo and @missy I hope this lesson is useful to everyone and remember: The greatest thing you'll ever learn is just to love and be loved in return!