Thanks for the query.
There is a possibility that you can also be infected with a cold sore as it can spread through an oro genital contact. Since you have had an oral sex with him, you may get the infection. If the immune response of your body is good enough, then you may not get the infection.
In any case acyclovir, prophylaxis m ay help you. Ask your partner also to get treated for the same.
Watch out for warning symptoms like fever, tiredness, rashes, oral papules, etc. Drink plenty of water and avoid dehydration and stress.
Hope this helped.
Feel free to write back for further clarifications.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.