Hey man. Sorry you are dealing with this. Read all of the links and take the vets advice. Your marriage is over. She left you and moved in with her brother so she could enjoy her affair. You are her solid plan b. Remove yourself from plan b. Focus on your life. Focus on bettering yourself. Focus on your happiness.
My EXWW did the exact same. Got a new job, started traveling with her boss. Emotionally detached from her family, mistreated me badly and blamed me for everything. She was literally going to move to his home state under the guise of "work needs me to".
Needless to say, my divorce was final May 17th. Five days after our 18th anniversary and seven months from confrontation about the affair. She dumped me a year ago with the ILYBIDLY speech, after she dedicated herself to her boss whos her fathers age.
Its time to get your life in order and be an amazing person for yourself and your kids. Thats all that matters now. Keep your head up. Its a very long rough road.
M:16 T:21 H(me) 38 WW: 38 S11 D16 D19 Red Flags of A: March 2018 ILYBNILWY: August 4, 2018 Moved out of MBR: September 24, 2018 BD/Confirmation of A: October 31, 2018 D Filed: March 27, 2019