@itsnotlight
My ex was/is like yours. The charger story - I could have told the same thing with countless other objects. He once sulked for a week because I had taken pity on an older man in a pub who couldn't get service and got the barmaids attention on his behalf. "You're so disrespectful" ok buddy. It was just total nonsense but like you, I felt he must be reasonable somehow, I tried so hard to understand it.
It's only in hindsight that I see he really loved seeing me on edge. He loved when I begged and pleaded. It made him feel like God.
If he ever did go too far and I started to pull back and go "wait this isn't on, this is a bridge too far", he was very sensitive to that and knew when it was time to be nice so that I'd be comforted and come back for more.
He got to know me very well, he knew exactly how to extract these huge ego boost from me, by making me beg and cry. And he knew exactly how to turn on the healing powers, where I'd be so desperate for things to get better that I would greet his new kindness with relief.
I don't think abusers consciously know that they use these cycles (possibly some do) - I'm sure they simply watch their parents do this, and it's just normal to them. It's how relationships work, to them. And it is a good technique. It hooks people and keeps them weak... Which keeps them close, makes the abuser feel incredibly safe and powerful.
What you experienced with the flowers was him checking in to ensure he's still safe and powerful. And you showed him that he was. Not your fault - you were responding honestly to what he was doing.
The issue is you imagine he's like you. He isn't. He's like himself. It might help to begin thinking critically about other people, to actually watch them to find out who they are. How they make others feel. Etc.
Never assume another person is just like you. There are billions of people in this world and they all have unique ways of dealing with others.
You may also want to read up on "tend and befriend". It may explain to you why you reacted so naively to this man when he was mean to you.
en.m.wikipedia.org/wiki/Tend_and_befriend
The upshot is - it seems many women may not experience"fight or flight" when they are stressed. They may release oxytocin (cuddle hormone), causing them to try to befriend others in order to find allies to defeat the threat. Your ex possibly was able to use this against you... He'd abuse you, and you'd try to tend and befriend him.
If you identify with this, it's possible for you to become conscious that you have that response to stress, and you can develop ways to maintain boundaries during stress so that you don't inadvertently cozy up to the next person who stresses you.