1. Lack of communication: You may not have fully expressed your trust and support for her, or you may have chosen to remain silent on certain topics instead of communicating directly. This avoidance makes her mistakenly believe that you have reservations about her, and thus feel untrustworthy.
2. Behavioral skepticism: Some of your behaviors may unintentionally reveal distrust towards her, such as frequently asking for her whereabouts, checking her phone or social media accounts, etc. These behaviors will make her feel that you do not trust her loyalty and honesty.
3. Failure to stand in her shoes: When dealing with problems, you may have been too firm in your own opinions, without fully considering her feelings and explanations, which makes her feel that your position is not respected and understood, and thus believes that you do not trust her judgment and decisions enough.