Yeah, pretty common. While wife is WW, she will drop people from her life that supported the M and you and only associate with new people who know nothing about you and only the story she tells. It's an addiction and she needs to surround herself with people who don't judge her and support her through her bad decisions.
Those friends who have gone through D and/or don't know you will only see her as unhappy and the fastest way to happiness is dropping you and moving on.
This is NOT the case and NOT logical, but logic and reason don't work with her right now. Again, she is not herself or who she was. She is an addict who needs her fix and will only be around the crowd that supports it until she hits rock bottom, if ever.
M-33 W-33 S-11, S-8 M-11, T-14 BD - 12/26, Divorce Filing and admits to affair (her) 4/18 I moved out 5/23