So sorry to hear that this keeps stretching out, but really happy to hear that you've now got 50/50 time with your kids. That is the most important thing, by far.
I have a very good friend who went through a difficult divorce and she has said the same thing to me, that she felt she had lost some faith in humanity and the ability to trust. I think that is totally understandable even as it feels heartbreaking... but I also don't know that you need to accept that as truth, forever. That is your truth today. In five years maybe you'll feel differently again. My friend has gained back a lot of what she had lost in terms of her ability to trust, and is in a relationship with a wonderful man. So don't write off the future. You've grown enormously through this entire situation and I am willing to bet your growth will continue. You are a very compassionate person. Don't forget to extend some of that towards yourself.
Me (46) H (42) M:14 T:18, D9 & D11 4/19 - 12/19: series of escalating BDs 9/20 - present: R and piecing