In terms of relationships, I probably am one of the most committed people you would meet. I also would like someone I could spend a lifetime together with. However, I would never think of a relationship in that way.
The reason is that I know a relationship cannot define me. If relationship defines me and my happiness, then I am not truly happy and confident in myself. I would unfairly be putting too much pressure and expectations on the other person.
So, I just do my own thing that makes me happy and satisfied. Then if there is someone that would like to be a partner, they can join my adventure if I think they are a positive force in my life. So that way, I don't compromise who I am or have co-dependency issues.
When I am single, I just have more time and money to focus on myself instead of mutual, relationship oriented goals. Pragmatically, singleness is a time to be a little more selfish and risky. Being in a relationship is a time to be a little more caring and conservative.