Responses
I'd guess he became a butler to ruin the family out of revenge or something and after he got everything he decided to stay by her side till the marriage since he really likes her, but says nothing as he thinks she doesn't think of him that way and he won't force her? He probably doesn't want to tell her because she might hate him then.
lol, mysterious collector looks just like butler, wonder how they explain that （￣へ￣"）