I'm sorry to hear you feel this way. It's really important to respond in a calm and understanding manner when someone you love accuses you of lying. Here's a suggestion: "I'm truly sorry you feel that way. I value our relationship and it's never my intention to be dishonest with you. If there's something specific you're concerned about, can we talk about it more in detail?" Remember, it's vital to understand the issue at hand and discuss it respectfully.