What do you after you fuck up? Onward or Inward

So this happens: You made a mistake, especially with your partner. The anger and the sulk felt not just right but righteous and now a day later you realise what a shit human you’ve been to the person who loves you with all their heart. What do you do next? You feel shame, embarrassment. You want to go hide somewhere. You apologise profusely to the one you hurt. You withdraw unto yourself. Am a bad…