Am i regretting my breakup or just feeling anxious?

Four weeks ago overwhelmed by work moving and an unhealthy dynamic where my girlfriend needed reassurance and I withdrew I coldly ended our relationship. We agreed to leave the door open for the future.
After two weeks of feeling relieved regret and anxiety hit me hard. I realized I love her and just needed space from the chaos not from her. I apologized and asked for another chance but she’s now understandably guarded and distant. She still talks to me and agrees to meet soon but she’s cautious and reaching out to my friends for advice.
I'm trying to figure out if I'm feeling real regret or just post-breakup anxiety. If you've been in either of our shoes did reconciling work out? Should I push to fight for her or step back and give her room to breathe?