How early can you tell a person you have depression

There is this girl l like, she is confident, beautiful and for some strange reason is kinda in to me. We both like each other but I feel like my depression is driving her away and I can't do nothing to stop it. I randomly stop talking to her for weeks, I take forever to take her out on dates, I avoid seeing her friends and worse of all I've never talked about my depression with her so she doesn't understand why I do this to her. I honestly feel like I should cut ties with her so she can be with someone better for her. I know I probably should not do that, so my question is how honest should I be about my depression with her without making her feel like I'm dumping my problems on her.