would this feeling pass

So I thought I was done with being angry at my ex but I'm not I'm still very much mad at her for breaking my hurt and honestly I can care less if she would just so happen to die but she brought out my anger because she kept calling me now I'm In a relationship a very happy relationship with someone i love and it upset me so much that I kinda had a attitude with my current gf which I don't anymore but I don't have any kind of feelings for my ex at all I just hate her. Do you think this would go away and I've been thinking about her lately because when she called me she told me how a lot of people had died in her family in the past month so I'm sad about them passing but is it wrong a part of me Wish it was her (she broke up with me to date her coworker we were together 4years and even engaged)