23M/23F — On-and-off relationship causing physical anxiety for both of us, how should we approach this?

TL;DR;We tried to breakup but we both are feeling physical signs of breaking up.The thing is, we still care about each other a lot. Part of me wonders if this intensity comes from unresolved emotions, attachment, or everything we’ve been through together.

At the same time, we always have some unresolved which leads to feeling like we are not compatible

So I guess I’m trying to understand:

Why would two people trigger this kind of physical anxiety in each other?Is this something that can be worked through in a healthy way, or does it usually point to incompatibility or unresolved issues?

I would really appreciate hearing from people who’ve experienced something similar or understand the psychology behind it.