chlamydia

ok ready,I've been with my boyfriend for like 3 years. when we first started talking and I mean like the first 2 weeks of talking he had sex with another girl. we didn't have sex until a year and a half into the relationship. after a few months of having sex with no protection, we decide one day to have sex, after a long day, in a movie theater. a week later it hurts to pee and im diagnosed with chlamydia. I tell him to get checked and he's.. in denial ig. saying no I dont have that I dont need to get checked. then he started getting symptoms gets checked, is diagnosed aswell and he claims to never have done anything with anyone else and he is the only person I ever slept with so please just help a sista out its a mess with my family and him and me and, just comment please.