I have pinworms and a guy perfromed oral sex on me (his mouth didn't make contact with my anus) and i washed before. will he get infected?

I cannot see where the exposure cited would transfer the agent causing pinworms (pinworm eggs) to the individual involved.

Your partner is very minimal risk. Pinworm is easily treatable. Visit this site for information: https://www.cdc.gov/parasites/pinworm/treatment.html#:~:text=The%20medications%20used%20for%20the,pamoate%20is%20available%20without%20prescription. Get HPV vaccine. Safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines