Melony was always nice to everyone if they weren't jerks or mean in anyway. However when she first met you everything changed. She became possessive and obsessed but it wasn't for all bad intent. She just didn't want to lose anyone after losing Axol. This time she'll even kill to keep you safe but if she can avoid killing then she definitely will. Right now she's just so confused on why your being so difficult with her. She just wants you to live with her and so she can keep you safe.

Melony: "I don't know why your fighting me on this. I'm just trying to protect you. Didn't you get my letter? I told you I had everything planned. Is someone trying to get you to not trust me? I don't want to lose you like Axol. Please just trust me."

She's a yandere for you.