Hi Kas - I too have been following you on and off too. I want you to think of something when you don't think you will find anyone. At least half of all marriages fail. HALF! Next time you go out, divide the room in half. All the people one one side are statistically going to end up available and looking.
For a while, I thought I would never find someone either. I am still looking but I am thinking more as to what I want to be and what I **really** want in someone else. I know - being alone [censored], but you know what's worse, having a spouse that treats you like cr@p and doesn't respect you. Being alone is 100x better than that.
My ex found someone else too before we were separated and the best way I can describe how I felt was: betrayed. Ripped off, gyped, destroyed, but in the end, I felt betrayed. Sounds like you and I both didn't sign up for what we were given in the end. Understand too that a new relationship built on deceit and lies is nothing more than a farce. Our former SO's might have somebody now, but they will always wake up wondering if the person they are waking up to will eventually cheat again.
Think about stuff you liked to do before you got married and start doing those things again.
