I was in a open relationship recently. I had just got out of a very long very serious rp so i wasn't ready to commit to someone physically but my new partner wanted a rp so we decided to have an open rp. We'd be emotionally monogamous to each other but could see other people. But in the end it didn't work out. She didnt want to see anyone but me and i felt like i was hurting everytime i hooked up with somone else. So it ended. I don't plan on doing anything like that hereafter. I suggest you don't either.