my ex husband is now in the LS with his new gf and i found out from mutual friends... im not okay

context. we were in the LS together for 6 years. he refused to do it anymore in the last 2 yrs of our marriage which was a big part of our split. now apparently he's back in it with new girlfriend and showing up at the same venues i used to go to with him. i feel like im going to throw up. like the whole "you wanted out" narrative he sold me was a lie and i wasted years giving up something i loved bc of him. how do you process this... do i avoid those venues forever now? do i confront him? do i just rage privately... brisbane btw