What is does it mean to reject?

When someone rejects you, it means they do not choose to be with you, or they refuse to be in a serious relationship with you even though you wanted them to. It may also mean they break off a relationship and decide you are the wrong person for them. While some people refer to this as being rejected, it can also mean the time was just wrong for the two people to be together, or they really were not compatible. It may not be proof of some defect in you, but rather, just a case of one person not feeling the same way you felt.