It's A Double Standard. Right!?

My boyfriend cheated on me in March of this year. I wouldn't have known if he had not come back with hickeys and scratches. He begged me to stay and forgive him. I've slowly given him back my trust. I recently found out that he had a baby with a girl from his hometown  (the baby was born in June, which is my birth month 🙄🙄. But that's another story). We recently decided that we'd have an open relationship. He tried to break up with me because he went through my phone and saw a conversation between a guy and me. It pissed me off that I only texted the guy, but he actually had sex with this girl. I said it was a double standard, but he said it wasn't. But he still wants the open relationship. How can you want an open relationship, but you don't want me to talk to other guys!? It's so confusing. 🙄🙄🙄🙄🤔🤔🤔🤔