Most likely your partner is fine. So many things cause irritation for us as women, and if you weren't feeling anything on Sunday, I'm sure it's fine.
If you aren't having an outbreak now, it's unlikely that this is an outbreak, and could be chafing from uncomfortable underwear, a yeast infection, even irritation from hair growing back in from the Brazilian.
I understand your concern, but the chances of your partner getting anything from you are very, very slim if you are on suppression and use condoms.