When someone shares that they are feeling insecure, it's essential to show empathy and understanding. Here's a suggested response: "I'm so sorry to hear that you've been feeling insecure lately. It's completely normal to feel this way sometimes, but it can still be challenging to deal with. I'm here for you - let's talk about what might be causing your insecurity and try to think of some solutions or coping methods that could help. Remember, it's important not to be too hard on yourself, and to focus on your strengths and accomplishments when you're feeling insecure."