Tell her the truth. It's not the ex you miss, it is the lifestyle, security, sense of family, etc. I don't miss her. I mourn the loss of innocence. I miss how I felt back then.

I keep thinking I don't deserve to meet someone yet because I'm "not over my ex," but the truth is, I am. I'm just not fully apathetic yet to the destruction she caused. Doesn't mean I'd take her back or that I want her, just that I'm sad it had to end at all. I think that's a very fair thing to feel, and any emotionally mature person would be able to appreciate that. Heck, if a woman said that to me, it would be a major green flag. To properly identify those feelings takes emotional maturity, I think.