Would it be wrong to out my ex's STD status?

I just got out of a long term relationship a month ago. My ex and I were together 4 years and talked a lot about marriage. I was his first girlfriend and I genuinely thought we would get married. I was pregnant with his baby and sadly miscarried two years ago. He has HIV but was undetectable so I didn't get it. He was abused in foster care so that's how he got it. I'm not trying to come off like I have an ego but I was truly there for him. I tried to help him build his relationship with his mom, the therapist he's seeing is one I FOUND FOR HIM. And honestly I don't care about that anymore. He's alone with nobody except his therapist so good for him I guess. But my bestie told me that he is now on a dating app. So I made a fake account and went on the app and found his account. His was saying he is looking for a serious relationship and loves anime and cats. Even though he JUST got out of a series relationship. Now I know this is petty but also think people should know, should I message all the girls online in our area and just warn them that he has an incurable STD? No hate and in reality I'm looking out for other women. Just think they should know dating him is charity work and they can write it off on their taxes