He’s done a right job on you hasn’t he the fucker? You can trust someone who has never earned the trust.
The only thing you can do is what is in your power, remove the emotion and the “she’ll have him they’ve won” bollocks (he isn’t a prize and she’d leave him again anyway). What is left?
You and your actions and your happiness.
You can rebuild friends. I’m off to the lakes next week to go walking with a group from outdoor friends on Facebook, never met them, they seem fun. I have another party with likeminded adults the week after I met on the last organised adventure holiday I went on, and have been out with individuals I met there in London and Birmingham.
I’ve got a few new horse riding mates and I’ve started a new job.
ALL within your grasp, you would be free, you and your pup, you could move near your kids, you could build a life on the things you enjoy. What do you enjoy? And mostly you could be all of who you are not a shadow pleading for the attention of a man who does not deserve you and will make you a wreck for life.
Throw his shit out while he’s away, change the locks and call a solicitor.