Seriously don't know what to do ): sos

I've been with my boyfriend now for 3 years and we've been so happy together and we never had serious problems before. I'm completely in love with him to the point where I want a future with him. Two weeks before our third anniversary I found out I had chlamydia and I've never even kissed another guy, let alone have sex with anyone but my boyfriend. I asked him if he cheated on me multiple times and he still continues to deny it all. Did he have to have sex with someone else during our relationship to give it to me? So many questions, I don't know what to do😕

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