My boyfriend wants to have sex but i'm afraid of contracting covid. can condoms protect against covid?

No: No. There is really no evidence of corona virus in the semen or vaginal fluid to date. Kindly note that corona virus is a respiratory infection passed via close contacts such as droplets, aerosol and also via saliva. Thus universal precaution is the best way to avoid infection. Good luck.

Covid transmission: The issue with having sex is that it involves close personal contact. Although SARS-CoV-2 has been found in the semen of some men who has severe COVID 19 infections, it has not been shown that the infection can be transmitted via semen. REF: https://www.cbsnews.com/news/coronavirus-mens-semen-survivors-sexual-transmission-covid-19/