Why did my boyfriend become distant since I am nicer and more calm?

So basically I used to be a pretty hard to deal with girlfriend. Since I had a lot of issues with childhood trauma and insecurities, I was a big drama queen. I used to nag, complain, criticize him at what he was doing, his hobbies, get angry with him easily and so on. But on the other hand I also helped him with his anxiety. Anyways, we had a long break of nine months, since it escalated. And from that day on I started to do everything possible to change. And I did change completely. A lot of self work and therapy made me into a nicer and calm person. No drama anymore, no emotional outbursts and so on. I even apologized to him for my behaviour in the past. It's been a year since we are back together, but for some reason my boyfriend became more distant instead of close. While in the past he constantly spent time with me, even though we were constantly arguing, me making drama etc. he now seems more closed off, doesn't talk much anymore and needs a lot of space. Which I do give him without complaining.

It kinda confuses me, shouldn't it be the opposite?

Why did my boyfriend become distant since I am nicer and more calm?
Post Opinion