Commitment

"People who avoid commitment are people who know what a big thing it is."
Commitment is a big thing and not something to take lightly in any type of relationship. Whether it be romantic, friendship, work, or a familial relationship. When you make a commitment to any of these relationships, it is a big deal. It means that you're willing to make the sacrifices and go the long haul with these people you choose. Therefore, avoiding commitment with certain people just means that you have made a decision, whether consciously or subconsciously, to not go through the thick and thin with them. It doesn't mean that you are heartless, I think it just means that a person is more self aware of their own natural selection process.