"They knew in January their relationship wasn't working but hoped they would be able to salvage what they had.
"Betsy missed Casey when he was on the road with Union J so it just didn't work out. "Casey is keen to pursue more television work while Betsy has been spending a lot of time in the recording studio in LA.
I initially expected the polyamorous people I met to tell me that there were times their relationships made them sick with envy.
After all, how could someone listen to his significant other’s stories of tragedy and conquest in the dating world, as Michael regularly does for Sarah, and not feel possessive?
The pair jetted off for a romantic holiday in Paris together last week and Marnie is already thinking about their future.
She told the Daily Star: "I'm getting older and want marriage and children.
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However, after failing to get through by himself, Casey was given a chance by Simon Cowell and joined boy band, Stereo Kicks. Michael is 65, and he has a chinstrap beard that makes him look like he just walked off an Amish homestead.Together, they form a polyamorous “triad”— one of the many formations that’s possible in this jellyfish of a sexual preference.“There’s no one way to do polyamory” is a common refrain in “the community.” Polyamory—which literally means “many loves”—can involve any number of people, either cohabiting or not, sometimes all having sex with each other, and sometimes just in couples within the larger group.Sarah and Michael met 15 years ago when they were both folk singers and active in the polyamorous community.
Taking to Twitter, Marnie, 25, wrote: "I finally found him. Casey Johnson joined Union J – who formed on The X Factor in 2012 – after George Shelley left the band.