Love, all spiritual or purely biological?

Is this great feeling (possibly the ultimate pleasure) of true love, that have inspired mankind to accomplish amazing tasks, and have devoted entire lifetimes of work for, merely a few chemicals in the physical brain? Makes you wonder why half of ALL marriages end in divorce. I always wondered this myself. I just wanted to know what you guys thought about the topic. I had a pretty emotional break up so girl and love is the last thing on my mind, in fact, almost to the point of disdainment, discust.

 

My parents were married for 23 years, and then divorced. I can't imagine being with someone that long, and then deciding that you don't love them anymore. It's odd to me. Most of my break ups have been pretty emotional, though I'm not to the point of disgust or anything like that. I still want to get married one day.