Advice and Opinions!!!!

Hey, yall! I recently found out one of my past partners and his new girlfriend of 2 months have chlamydia. The last time he & I had sex was almost 4 months ago, and I haven't had any symptoms. And the only reason they found out was because she started bleeding during sex. She says she didn't have it before him, and he's the only person her & I could've gotten it from.