But think about this. Deepening intimacy without defining a level of commitment is dangerous. It's like going mountain climbing with a partner who isn't sure she wants responsibility of holding your rope. When you've climbed two thousand feet up a mountain face, you don't want to have a conversation about how she feels "tied down" by your relationship. In the same way, many people experience deep hurt when they open themselves up emotionally and physically only to be abandoned by someone who proclaims he's not ready for a "serious commitment".
-Joshua Harris, I Kissed Dating Goodbye
I swear, every word in this paragraph helped me understand about the importance of commitment in every relationship. No one wants to be abandoned and left out especially when much has been invested in the relationship. Committing without thinking and reflecting properly can only result to hurting yourself, the other person or both parties. That's inevitable.
Put into simple terms, committing to someone is a big risk. You have to expect every possibility how you're relationship will turn out. Then comes, enduring all of it. The moment you signed up for it, there is no turning back. You already gambled on it. It will be great if you win, but what if you don't? There's always two sides of the coin, remember? :)