If you want world be in your chance, want one person who wants you too
I understand the second part of that – in order for love to be successful, it must be reciprocated. The first part confuses me a little bit, but I assume the saying means something like:
If you want to get the most out of life, love a person who will love you back
(The phrase get the most out of is an idiom meaning “to achieve the greatest output of work, effort, production, etc., out of something”)
I tried to find a suitable saying that roughly matches your request. I couldn't find any well-known sayings, but I did manage to find some clever quotes. In some way or another, they are about a life fulfilled by mutual love.
Love is just a word until someone comes along and gives it meaning!
— Paulo Coelho
A successful marriage requires falling in love many times, always with the same person.
— Mignon McLaughlin
Love doesn't make the world go round; love is what makes the ride worthwhile.
— Franklin P. Jones
That last one isn't a very good match with the Persian proverb, but I thought it was witty, so I decided to include it.
I also found this one:
You don't marry someone you can live with, you marry the person who you cannot live without.
However, to match the Persian proverb, I'd have to reword that:
You don't marry someone you want to live with, you marry the person who cannot live without you.