2. He suddenly talks to you more politely.
The way your boyfriend talks to you can also indicate whether or not he’s telling you a lie. “When my boyfriend is hiding something from me, he starts to use words he doesn’t normally use, and he doesn’t even realize that he’s doing it,” snickered a woman in her 20s. If you have reasons to doubt your boyfriend, pay attention to everything he says, and try to catch any contradictions in his stories.