Possibly std

I don’t have any symptoms but me n this girl shared a guy and she had contacted me saying she has white bumps on her and I before I found out I was with someone else and now he says he has bumps on his tongue… I don’t have any symptoms. I’m going to get tested but I’m scared.. what if it’s something that isn’t treatable and I can spread it to other ppl. What kind of stds are always spreadable once you have them. How do stds work and if it’s treatable Is it one and done or lifelong or like what I’m so nervous and confused.