Its recommended that you both abstain from any kind of sex together while on the treatment for an STI like chlamydia, gonorrhea or syphilis. Using condoms does not completely protect against STI’s and you want to be sure that you have both been treated well before having having contact again. You may find this posted question and answer about chlamydia treatment useful: https://smartsexresource.com/ask-us/questions/can-you-have-sex-condom-within-7-days-u-were