hi everyone.
i wanted to ask, is pathological jealousy a thing? 
yesterday i was with a friend of mine who’s been feeling blue these past days.
i told him he could talk about it to me and he kind of did, sporadically.
at some point he was like “you know so much stuff, you’re so intelligent” and i told him that he too was intelligent. then he said “i think i’m jealous that’s it” 
and after that he said “i just have to get over it, i’ll feel better tomorrow”.
now my question is, how can i make him feel better? and, is our relationship toxic if he feels jealous around me? is this something that can go away or...?