A rational view of love

I'm currently reading The Reason For God by Timothy Keller. It was a Christmas gift from my oldest son. It is a book specifically for Agnostics like me. So far, it has been an interesting read. I would recommend it to any Agnostic, Atheist or Skeptic. It is not preachy.
I just finished Chapter Three (Christianity Is a Straitjacket). A few quotes caught my brain and necessitated re-reading.
In The Four Loves, C.S. Lewis wrote:
"Love anything, and your heart will certainly be wrung and possibly broken. If you want to make sure of keeping it intact, you must give your heart to no one, not even to an animal. Wrap it carefully round with hobbies and little luxuries; avoid all entanglements; lock it up safe in the casket or coffin of your selfishness. But in that casket - safe, dark, motionless, airless - it will change. It will not be broken; it will become unbreakable, impenetrable, irredeemable. The alternative to tragedy, or at least to the risk of tragedy, is damnation."
That struck me as enlightening and profound. One of my first feelings was a feeling of awe that someone could put pen to paper and express such a deep thought. And that they would be willing to bare their soul and share the thought.
Keller writes:
""When you fall deeply in love, you want to please the beloved. You don't wait for the person to ask you to do something for her. You eagerly research and learn every little thing that brings her pleasure. Then you get it for her, even if it costs you money or great inconvenience. "Your wish is my command," you feel - and it doesn't feel oppressive at all. From the outside, bemused friends may think, "She's leading him around by the nose," but from the inside it feels like heaven.""
I guess we're back to the standard about "better to have loved and lost". Or that love makes you do stupid things or act like a fool. My opinion is that most of us have some humanity within us. Our individual collective (that is NOT an oxymoron if you take a minute to think about it) personal history has forged what we interpret as important enough or worthy of our love. What matters is that we don't fall prey to the "safety" of disdaining love or, to paraphrase Lewis: The alternative to the tragedy of a painful love is damnation. If you're going to be damned if you do and damned if you don't, you may as well gather some pleasant memories that will bring a smile to your face when you're 88 and sitting in that rocking chair in the sun room.