as an STD counselor, a lot of people suffer from shame which is why people don't test regularly & inform their partners.

condoms can't protect you from an STD

I've dated individuals seriously after being casual & having an STD issue come up

be an adult, that's all I can ask

but I think the real situation here is that this personal wasn't an adult about it. And wasn't an adult about other situations. So I'd go with no.

An STD isnt' a deterrent if they're open, honest & truthful