Signs of cheating .

Ok he isn’t as obvious as others , I do but I don’t have a feeling but I do feeling he is cheating or atleast micro cheating the thing is I have nothing to back it up , I just need sure signs he doesn’t give me sneaky vibes , but he does at the same time the thing is I am severely worried and when I do say something about it he never like declines or reassures me that he’s not ... which I am just worried