Gary Mitchell wrote:
But she did give him a reason not to trust her: she lied. He caught her "tell".
The point is, even if she was keeping a secret, he should know her well enough by now to know that she's a good and trustworthy person and that, if she did need to deceive him, it was probably for a legitimate reason. One single deception shouldn't be enough to make him forget everything he knows about her character and start assuming the worst. That's how trust works. If you really trust someone, you don't toss out that trust the moment they're less than completely honest with you. You have faith that there's a good reason for it.