Not would I (me) want to have my h back, would I want to be this other woman. Given what you have said about her I think you would say no too.
I always believed my x and I were meant to be tog. He was in my life from aged 5, we played together,grew tog, dated and m, and had a family etc all together. That is a huge amount of years. We did have a happy marriage until about 6mths before he left. I put it all down to job pressure etc.
I would have taken him back in a heart beat and 8 yrs on I would never close the door to him, but I know it will not happen. He is m, has made a new life and is a v proud man. I have not put my life on hold or even think about the what ifs.
We all believe or most do that we are meant to be together, we pray and we cling onto that. We need that slim hope especially after so many years because what is the alternative----too frightening to even contemplate I know. God may not give us what we desire but He always gives us the strength we need to survive the unthinkable.
I really wish you well and hope you do get the outcome yo wish for in the meantime listen to the early advice I got. Protect yourself financially as best you can. Take care