Forcing HER to make a decision isn't MANNING UP. No no no. Don't you see that she doesn't want you to wait for her??? Don't you see that she wants you to stand above her and lead her? As long as you are weak, the waiting, pining fool, she gets no strength from being your woman.
YOU must make a decision, every day, about what you will or will not accept. So far, you have woken up every single day accepting that you will be a doormat for a woman who isn't sure about you and who cheats on you. Don't lower yourself this way any longer.
You are cheating yourself by keeping the door open for her. Turn your back, close the door, look ahead to the possibilities of a happy life without her.
You don't have to file. You don't have to tell her anything. Just tap into your disgust, harness it so that you can see how waiting around devalues you, brush yourself off, chin up, and look ahead. Get out and GAL.