Trust issues

Having lots of trust issues with my fiancé 😔 he will do certain things and make me wonder if he is being honest with me . I know there is no perfect relationship but i thought we were close . Apparently i was wrong . I hope my gut feeling isnt right because if it is idk if we can make this right the way it used to be 😢 am i the only one dealing with this ? How does your SO react to certain guestions you may ask when fishy things happen n you comfront him ?