boy help?

i’m good friends with a boy. let’s call him c. we’re not ever going into a relationship, just there for each other, but we’re fwbs. c and i have a really good relationship. now for some reason, every time i mention him to my parents i get awkward. i don’t have feelings for him, but i once did, and my parents don’t know that. jumping to the point, they think we’re together. i don’t know why that bothers me so much but it just does, so every time i mention we’re meeting up or even when his name passes into coversation, i go all weird when i tell my parents. any advice?