got cucked by an pi kapp

I am in Sig Ep (rush us btw) and I have to get this off my chest somehow. I recently dated a girl in AXO, and she recently met this guy at Sig Ep, and asked for an open relationship. Idk how to feel about it, if she sees this or him that would suck lol. I can't talk to my brothers about this because I feel ashamed. Maybe you guys can help?