He did end things with her (I know that for a fact).
@Strawberrina, you wrote the above on 4/22, but by 4/24 you had discovered that this was a blatant lie. The devious liar had bamboozled you, and he still is.
Your H never intended to keep OW at a professional distance. He never built iron-clad boundaries around her or seriously looked for another job. Even after witnessing your great hurt the first go round, he twisted the knife by keeping the affair going and exposing you to OW’s perfume on the shirt he wore when they embraced. He shat on you again from a great height.
He is still doing a number on you. Having messed up with the shirt, he is practicing damage control by coming home at lunch and at 5:00 to placate you. He’ll be creating alone time with OW during the work day.
Most of your anger is aimed at OW, your H’s junior. Despite his being a practiced liar, you are desperate to believe the narrative that she is a manipulative operator who targets him, this poor Diddums who is her Boss. You convince yourself that she seduces him, so he can’t help making unethical personal and professional choices.
It is disturbing that you are colluding with him to gaslight yourself, @Strawberrina. You have not changed your response to his repeated infidelity, yet you expect a different result. Would you advise your children to cling to serial cheats and impose no effective consequences?
I asked previously but you have not yet answered: How long had the affair been going on prior to DDay1 last year?