It's a bit of a difficult post to follow but I'll give it a go.
If you were in a Poly mono V, where as you were the Mono and things fell apart for whatever reason. would you choose to go back to another poly relationship? I've been asked this before and each time I have a slightly different answer. I wouldn't look for a poly in particular but I also wouldn't discount someone because they were poly.
As for going back I probably would if work had been done etc. But I'm older and wonderful men are not bountiful.
Hope it helps, sorry you're sad.