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It sounds to me like he's still got some wounds that are healing. What is the context in which he brings her up? Does it sound like he's missing her? Does it sound like he's just wanting to "talk through" all the mess of feelings that people go through when they've gone through a really rough breakup (people will do this when there are things they're still trying to make sense of)? Is he bitter? Is this something he does to try to explain to you where he's coming from?
My advice is to ask him these things - why does he feel a need to bring her up so much? What is it that is keeping him from moving forward? Is he stil angry with her, or is he angry with himself? Maybe a bit of both? Sometimes a person can still get wrapped up in those old feelings of hurt without really realizing it (I'm guilty of it myself), and it makes it difficult for them to move forward until someone gives them a bit of a nudge to do so. I will tell you this: letting go of residual feelings of hurt after a bad breakup is TOUGH...even almost a year later. However, if he does this often enough to make you uncomfortable, he may need a reminder that you are NOT her, and that he needs to work on moving forward. I highly doubt he does this for the sole purpose of hurting you. It just sounds to me like he hasn't gotten over the "grief" part yet...and if things ended badly, I can understand that. However, your feelings matter here, too, and it's never easy to hear someone you love talking constantly about someone they used to love. I feel that the best thing to do here is to simply open up a real dialogue about this with him. You certainly don't have to sound like you're being insensitive or insecure, but simply curious as to what's holding him back here. Because whatever it is that holds him back will almost certainly end up holding you BOTH back, too.
What concerns me about him continuing to call her "stupid" or "crazy" (whether she is, or if she just made a decsion for herself and executed that decision badly, I don't know) is that he could wind up inadvertently making you pay for her mistakes in some way or another. I feel that we're all entitled to blame the "dumper" for the whole thing for a limited amount of time, but once we're truly ready to move forward, we have to ask ourselves, "Okay, now where did we BOTH go wrong, and how can I avoid making the same mistakes in the future?" if we want to come out healthier on the other side.
"Are tangerines really just oranges that didn't want it enough?" - Random Greeting Card