Diagnosed chlymadia?

My boyfriend recently diagnosed with chlymadia, and I'm clean from that. But he believe it was from the past people he done it with before we got together. He only needed to take 1 dose and I heard it goes away within a week and avoid sex for a week. But what if we have unprotected sex once it's gone passed that week, would he still be reinfected from someone that doesn't have it? Like can it come back
Diagnosed chlymadia?
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