Please help how do i tell my boyfriend i might have given him chlamidia

Okay so my boyfriend and I we have been dating for a while now. Im 18 and hes 17. He graduated last year though because of his credits and i graduate this year. I got stupidly drunk some time ago at a party and had sex with one of his friends and I honestly didn't remember until his friend texted me. We promised each other to keep it a secret but now I feel bad. Well his friend ended up giving me chlamidia and I've still been having sex with my boyfriend since the time has passed. I'm really worried that I passed it to him but I'm too scared someone please tell me how I talk to him about this

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