> I'm half fearful half dismissive

That’s why, right there, that’s called disorganized attachment. People like that are even more likely to focus on the physical as it’s a way to feel close with out risking the messiness of being close emotionally. If your relationship break up triggered your attachment issues, it could be that you’re becoming even more focused on the physical as a self protection mechanism to avoid hurt but still have some level of closeness, thus the reason for the physical infatuation, even though you’ve not been like that before.