You shouldn't spy on your significant other
Gary hears his girlfriend whispering in the next room, he suspects that she is talking on her phone.
Gary wants to find out who his girlfriend was talking to in the next room.
Gary expresses his concern that his girlfriend was speaking so softly on the phone and asks her if everything is alright in their relationship.
Gary waits until his girlfriend is asleep and looks through her phone history.
Gary's request for an honest conversation about his concerns are met with an honest reply and their relationship becomes stronger as their bond of trust increases.
Gary violates the trust that his relationship is built upon and weakens the bond between himself and his girlfriend.