Wa'alaikumsalam. hmmm if that someone doesnt know that u feel that u can no longer trust them, then i think just live it normally like that person doesnt know n if u know that person is lying, u just lyan n go "yeah, awu, bnr tu" smthg like that lh usually nya. but if that person knows that u can no longer trust them either u tell them or both of u feel that way but u guys didnt say that u dont trust each other anymore. then its the same, just act normally like if u want to believe, believe. if not, inda pyah n dont say rude or bad things when they are lying or smthg but some ppl would do that but the person doesnt bother abt it bcuz they know that they are lying n i hve an actual friend who has this kind of person n lastly, they are bestfrens now.
(likers gets a short note) hi !! i dont really know you but you seem friendly and ya sorry i dont really know how to give you anymore note though :-( but yay we're the same age and ya all the best for your upcoming examinations !! 💗😌 alhamdulillah you will pass all your exams :-)