herpes

hey! my partner is freaking out and he is seeking advice. he shares joints and vapes with his female driver at work. he found out through my mom (she works in office at the company he works for) that she had a doc appt to get checked for oral herpes cuz she has over 20 sores in her mouth. anyways he is getting paranoid that he is gonna get it. what are his chances? edit: she does have it and he switched his drivers edit: I am also a tad worried myself for getting it and he has also shared joints with our friend too and he would have passed it on to his pregnant wife edit: he's a trucker and they all smoke pot at this company and others here lol it's very common in our town.