Struggling with jealousy in my polyamorous marriage

I am starting to feel like my marriage is failing. me and my wife were Polyamours for awhile but we decided to take a break and focus on us, but my wife is on her phone 24/7 and when I tell her the flirting with people is making me uncomfortable she says she's gonna stop but yet everyday there's more people that flirt with her. it's really starting to bother me and I can tell my depression is getting worse because I feel like I have to complete with other people. some days I want to throw in the towel and others I just think to myself that she's just trying to be friends with people and they just want to flirt. I no longer know what to do. and my anxiety/depression has me believing that someday she's just gonna leave me for one of them. Im lost anymore