Lord help me🤦🏻‍♀️

Hey guys! 😄 so need advise! Im newly single and I'm talking to this guy whom ive had as fwb in the past, again. We still want a fwb relationship but I was diagnosed with genital HSV1 since we last hooked up....how do I go about disclosing that I have it to him without freaking him completely out? Or should casual fwb relationships just be out of the question?