When Is The Best Time To Be Treated For An Sti?

I’m 30 years old and have had my first sti 4 months ago. I’ve never been with any guy who has had an std other than this one person. All of our sex was condom free but i still got it since he licked me after we were done having sex which is very common if you know what i mean? But now, im really worried about another outbreak because its only been a month since the last one so im thinking that maybe im not cured or something? Any ideas on when to get tested again?