What are some petty things y'all consider as cheating?

For me its (irl experience btw)


-Letting someone else feed you
If your not hospitalized, have two broken arms or Its not someone apart of your family why would you letting someone else feed you infront of me??? I have two perfectly able hands, why can't I feed you??, that level of closeness should be reserved from your family and your partner and maybe best friend. It makes me feel like some sneaky link on the side or some third wheel interrupting your date. I really don't get it. If its not a big deal why can't he feed me too "It's not a big deal".