Have you ever had to do it? If so, how did you tell them? How did they react?
I’m lucky to have never actually had a bad experience with this. I have unfortunately had chlamydia twice, and just to be safe I sent a quick text message to the people I had had sex with since my previous STI test. They were all really good about it, thanked me for people so open and honest with them and said that they would get tested themselves. I’d heard some horror stories of people freaking out when being informed a sexual partner has has an STI, so I couldn’t believe my luck!