I think that it's normal. I've done it, and still do sometimes. I'm not in-love with my ex, but I wouldn't want to see anything bad happen to him either. It's just like when someone passes away, you just don't stop remembering that person because they are gone. Your husband seems really sensitive about you talking about this, so I wouldn't mention it anymore to him. Anyways somtimes a bad relationship can be a benefit, because we learn about what we want, and don't want. What better way then true experience.