Is your fiance cheating if he doesn't tell you little things?
Not necessarily you should maybe communicate with your fiance
and tell him what you are feeling this is probably the best way.
Every human being has little things they don't tell their mate and
it's not on purpose but simply because it's not consequential. As
long as you are honest with each other about serious things in your
life then that's what counts. Stop worrying so much!