I know this is probably a bad idea - but I feel like poking him again regarding his living situation. If he is really living with OW - then he will have left me abruptly, moved in with an OW he claimed to have been seeing for only two weeks prior and then insisted on a divorce three months later. I think that would make it much easier to truly detach and even drop the rope.
Honestly the leaving abruptly and filing for divorce thre months later should be enough.....