I think it is virtually certain that you were infected well before the sexual encounter that you describe. And we can’t know if it is oral or genital.
Disclosure is a tough one. Oral infection is more likely than genital infection with HSV 1, so my guideline is to disclose your HSV 1 status prior to giving someone oral sex. Others have different recommendations. But that’s mine. genital to genital transmission of HSV 1 is uncommon for sure. But oral to genital transmission is quite common.