Just found out partner has cheated

So I had a call from my doctor As I have been having a lot of pain and things going on, he tested me and I have chlamydia! I have been with my sons dad for 4 years! And was very loyal

During lockdown we got separated as he works and lives far away but was all arranged properly, his excuse is he was lonely etc

I was too but didn’t go off sleeping around!

I feel sick to my stomach 😢