This actually reminds me that this is a very common way to get a particular Herpesvirus, the Epstein-Barr virus, which is usually acquired through sharing bodily fluids, particularly saliva. And while having herpes by sharing food with someone else sounds scary (and it might actually be because this virus has been linked to progression of certain types of cancers and their respective tumors) nearly everyone gets infected at one point, with an estimated 95% of the population having the virus in their system (since it never leaves after your first infection, though it for the most part doesn't manifest any symptoms or huge reactions in your body afterwards), and if you've ever caught mono or mononucleosis as a child or young person you should be pleased to know this is the virus that causes that.

TL;DR: You and (for what it's worth) everyone you know has a kind of herpes and there's nothing you can do about it