Friend's boyfriend had herpes, need advice

My friend's boyfriend recently told her about him having herpes a few years ago on his stomach. He got treated and never had it again. Now we both lack knowledge on this and wondering if this something to get worried about. She never had a outbreak or anything and has not done any sexual intercourse. They have done few things but not the main thing. Is there something to be worried about or take precautions in the future.?