Is it normal to regret breaking up right after?
Yes, it’s normal to second-guess a breakup right afterward. Missing someone or feeling lonely doesn’t automatically mean ending the relationship was the wrong choice.
A breakup can bring a rush of grief, doubt, and “what have I done?” even if you had good reasons to end things. You’re losing familiar routines and closeness, too—not just the relationship as it was on its best days.
Give yourself a little time before treating the first wave of regret as a verdict. It may help to remember what led to the breakup and ask whether you miss this relationship specifically, or simply miss having someone there. If you ended it impulsively in the middle of a fight, that may be worth reflecting on; if you’d been unhappy for a long time, missing your ex doesn’t erase that.