Introspection and reflection are a necessary part of our lives, when we need to take time to figure out what's working and not working in our lives.

I don't know if you're codependent but you may want to explore what your system of values or core beliefs are with a therapist, to determine why you find yourself in one-sided friendships with people. Once you figure out the reasons why you allow that to happen you can take the steps needed to stop that pattern with your interpersonal relationships. It's all about the pattern. The universe is made up of patterns, so it's figuring out which patterns benefit you, and which ones don't benefit you. Does that make sense?