I still feel so torn over whether to wait this thing out or move on. I mean I know all the things I need to do for myself, but I feel like it wouldn't take much to shift my thinking and just be done with her, whether she comes around or not. I have loved her most of my life, but how can I be with someone who can leave me like that...as if we meant nothing. That isn't love, and even if she comes back around, do I want to be with someone who is capable of doing that? I'm not capable of that and how do I know that if she comes back around at some point she won't do it again. I love her enough to wait, but I'm just not sure if I should.
Those are all valid feelings and thoughts.
Gerda is correct, you do not need to decide anything right now.
I understand the torn feeling between waiting and moving on. So maybe do both. Stand and move forward.
You are right it probably wouldn’t take much to shift your thinking and be done with her. But would it hold? How long until it shifted back? When you want to change your thinking do it for you. Make changes not in an effort to be done with her, make changes for the betterment of yourself. Those will hold. Those will last.
Feeling and thoughts, so fleeting. Give it time, feelings do change. Allow your beliefs to form, you will find answers and direction.
Feelings are fleeting. Be better, not bitter. Love the person, forgive the sin.