So far for humans it has been the case that ego develops and then humans are stuck with it for the rest of their lives.
I know that at the core of each religion there is the truth, heavily obscured in some cases, but it's there.
What is commonly called 'falling in love' is in most cases an intensification of egoic wanting and needing. You become addicted to another person, or rather to your image of that person. It has nothing to do with true love, which contains no wanting whatsoever.