He was acting super distant the week before he broke up with me but kept saying nothing was wrong that it wasn’t my fault and I shouldn’t worry

He was acting super distant the week before he broke up with me but kept saying nothing was wrong that it wasn’t my fault and I shouldn’t worry. Then boom he breaks up with me out of nowhere. He said There’s nothing you could’ve done differently but also admitted he was just unhappy for reasons he couldn’t explain? Like he legit couldn’t give me a reason for why things changed even though he was reassuring me everything was fine just a week ago. I don’t even know how he thought I’d handle that. I just want my boyfriend back but it feels like the person who loved me is gone and I have no clue what happened to him.