He hits you for the first time, and then he absolutely falls apart. He is horrified, heartbroken, disgusted, he deserves to die etc etc etc and you put your hurt and anger aside to pick up his pieces and tell him its ok. He's a good man who made a mistake.
The second time he hits you, the meltdown after is smaller. He cries, he brings you flowers, he tells you how sorry he is... but he reminds you that he's not the only one at fault here. You were part of the argument too. You're both in the wrong.
The third time he hits you, he's very sorry, but you made him so angry. You know how hard he finds it to control himself when you do XYZ and you need to take responsibility for that. Though of course he's still sorry.
Fourth time, he's sorry that you made him hit you again.
And every time after that he's not sorry, because it wasn't his fault. You need to be more XYZ, do less XYZ.
People always say they don't know why abused women don't leave the first time they get hit, and it's because of the above. It's a slow, manipulative escalation designed to get you to stay. It's the frog in the boiling water.
He's shown you who he is. Don't waste 6 more years being beaten down and broken by this man. You deserve better.