My ex-gf is calling me by my old nickname she gave me

I was in a long relationship with a girl but she broke up with me a few months ago. Before we were in a relationship she gave the crush-name "melon🍉" and now after we went no contact she sometimes messages me (not necessarily nice, kinda weird messages) and in those messages she calls me "melon" . And now I wonder what that means and if she does that in manipulativ way to get a answer from me since I always ignored her. I decided to completely block her because I'm trying to move on 😭.