Help ladies

I don’t know how to come to my boyfriend about my test from the doctor coming back as abnormal for chlamydia the last time we talked he said the last time about something close to this he said the last time he got tested was 3 years ago I haven’t had sex with anyone else it could of been his partner before me that passed it to him and he passed it to me who know

Ladies I need ur help leave the negative comments from this post please

How should I come to him and tell him about it ?