I recieved the same advice .. multiple times. I think for many betrayed spouses the hind sight is "Should have cut my losses and moved on from day one" .... can not fault them for that .. their feelings are their feelings, I think looking back I wasted a solid year of energy spent on W, her A, and OM and would very well indeed have been better off without that.... but I think if we LBS's were able to do that so easy we might just be the WAS in reality.
There is nothing wrong nor weak about someone who stands and tries to fight for their marriage ... and if you can do that WHILE discovering yourself, growing, coming to grips with some hard truths ... the journey will be worth it regardless.
I agree it would be easier to toss in the towel and let the M go, note I said easier .. I do not believe its the right thing to do, nor could I after 25 years look at myself the way I wanted to without at the least trying.