STD's aren't diagnosed (mostly) just by looking at people. That's exactly why they're so tough to eradicate.
Wear protection and protect yourself. You did just fine here. If he is unwilling to be up to your safety needs, then he's not worth keeping around.

















To quote a novel of greatness:
"In the beginning the Universe was created. This has made a lot of people very angry and been widely regarded as a bad move."
And somehow it led to me using Linux like fraking forever.