I'm uncertain whether I should simply accept my losses.

I'm 24, and my wife is 23. After five years of marriage, we find ourselves at a turning point. My time in the military has changed me, leaving me feeling like a shadow of my former self. I know I've made mistakes, and she’s expressed that her needs haven’t been met. I’ve made numerous attempts to become the partner she needs, but my struggles with depression and a demanding 60-hour work week have always gotten in the way. Recently, she found someone else who seems to fulfill her needs. Two weeks ago, she suggested the idea of an open marriage with this new person, assuring me that I would remain her primary partner since we’re married. She claimed that she has always felt polyamorous but had suppressed those feelings for a long time. She insisted that her request wasn't due to my shortcomings, and I wanted to believe her. Out of fear of losing her, I reluctantly agreed, but it has been haunting me ever since. Yesterday, overwhelmed by my insecurities, I reversed my decision about the open relationship. In response, she revealed the truth: she sought someone else to meet her needs because she felt she had no other choice. Now, she’s given me one last chance to improve myself. However, her feelings for this other person have grown during the time I initially agreed to the arrangement, making it difficult for her to reconsider leaving him. I now have two months to work on my issues and transform into the person she needs while also coming to terms with her seeing someone else. I believe that through therapy and self-reflection, there’s a possibility I can accept the situation and make positive changes. Yet, I’m terrified that she hasn’t fully decided whether she wants to give me another chance, and I fear the damage may already be too significant for her to love me the same way again. There’s a real possibility she might end up preferring this other person and choose to leave me altogether. She promised to give me an answer soon, but I’m left feeling lost about what to do next.