Commitment isn't everyone's cup of coffee, or tea for the tea takers. Exclusive relationships come with a lot of baggage, you know.
People date and commit for decades then one day things refuse to work and the once concrete and stable union crumbles down like the Bibilical walls of Jericho. Heartbreaks are a result of commitment and expectations. Humans are humans, we're bound to disappoint each other, sometimes a little just, sometimes the disappointment never has a comeback.