Not missing my ex?

Hi everyone, I want to preface, I’m not looking for breakup advice or need someone to tell me to get over it, I’m looking for if anyone else has experienced this.

My and partner and I recently broke things off a month ago, if he was interested I would be willing to get back with him, obviously changes would be needed but that’s not what I’m here to speak about.

The thing is I don’t necessarily feel as if I miss him. I do have somewhat of a longing for him but I also don’t really feel like I miss him and I can’t understand why. I’m still having rocd thoughts even though we aren’t together and want reassurance from him but can’t ask because we are no contact.

Has anyone here had this, I can’t understand why I don’t necessarily miss him. And haven’t really since we broke up. Because I’m not happy we broke up, I felt like we were in a rough patch but had something pretty good.