How old are your kids? Sorry - I know you mentioned them earlier on but I’ve forgotten.
I thought the same when my H told me. He actually said “I’m seeing someone and I want to tell the girls about her. Not introduce them, but just let them know so they get use to the idea”. We didn’t discuss timelines or anything like that, he didn’t give me a chance tbh. When I thought about it I decided why fight the tides. At least yours had enough respect to give you the six months notice - not just sneak around and continue lying and then tell you out of the blue.
Hope - there is a difference between wanting someone to be a part of your family life and parading a random string of women through your children’s lives. If your H is willing to wait six months (and he respected you enough to let you know) then that is something. I know it’s tough. I know you still hold out hope of a reconciliation but the best thing to do is sit back and let it play out. . I grew up in Australia and if there’s one thing we learn it’s when caught in riptide, don’t fight it. Ahern you come up for air, you will be a long way from where you started, but you will be ok. continue the path you were on. This changes nothing. It only makes it more transparent.
I don’t know how long my H has been seeing this woman but I trust that he wouldn’t have come to the decision lightly. I have no doubt that there has been a string of women since we broke up. I have no doubt that he lied and lied and lied. But I know he loves his kids. Ask yourself would your H do something to hurt his kids?