Well said, DF. An unpleasant truth.
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When you see that the other person really has no interest in improving things, it basically tells you that you aren’t worth the hassle.
Bro, you need to reframe that, for 2 reasons: 1) reframing will help you, and 2) you're wrong.
Your W's lack of interest is about her, not about you.
At this point you don't know if your W' lack of interest is widespread or focused on you. Even if it's focused on you, however, the fact isn't about you. If she's uninterested in connecting with you, that's about her, not about you.
You may not be worth the hassle to her, but you are worth the hassle for you.
She cannot validate you. You have to love and validate yourself. And since you're loving, lovable, and capable, it's right to love yourself.
I know it's probably impossible to avoid tremendous self-doubt after being betrayed. I know it's probably impossible to question one's desirability.
Part of healing is facing your doubts about yourself and dismantling them. And part of your healing is finding the strength - it's already in you - to end a relationship unless your WS honestly wants you.
Love is giving and taking. You can stay with your W, or you can leave, even if she's not giving you everything that you want.
Whatever you do, however, it's best if you do it based on the idea that you are most definitely worth the hassle.
If you can't get there on your own, a good IC can help.