Blaze had developed feelings for you. But you were into Amy Rose instead. This led Blaze to being a yandere, grabbing as much information as possible about you specifically, putting pictures of you on her walls, and murdering anyone who conflicts and even tries to touch you. All kept in secret.

So, I'll skip to a random moment for you.

"I apologize for the mess, but I had no choice. She was in our way. Don't be alarmed, she's not dead~ But now, she won't be getting in the way of you being mine. Right, Ms. Rose?"

Amy was passed out. And that's when Blaze took her back home while she was still unconscious. It took only around 5 seconds.

"Now... Where were we~?"