Commitments are defined as being committed or with someone and not anyone else. There are different types of relationships so not everyone has to be fully committed to each other. This relationship may be an open relationship where the people can see other people.
However, many people do feel committed to each other and want their significant other to be committed to them. It is important for you to be committed to your significant other, but it is just as important for your spouse to be committed to you.
It is also important for you to be aware of his or her commitment. If you know that he or she has commitment problems prior to getting involved with him or her, then there is a problem with you.