vent/possible advice?

lately it’s been feeling as though my S/O is cheating.? like idk.. i’ve caught him in miniature lies (going to hang out with the guys but the location you’re saying you’re going to is actually occupied by female friends) or getting random calls between 11pm &’ 4am but when i bring that up, they magically disappear. i feel like im dating a narcissist &’ i honestly feel like im being manipulated but i cannot for the life of me pin point how.. like there’s always a valid “excuse” for the bs. or maybe i’m creating the excuses ? idk.. but im losing it over here. 😂