My guess answers to your questions.
- Yes
- Because Subaru protected her.
- Because she loves him
- Because he saved her in the future/past. Some timewimey shit.
- A Time paradox
- No, Satella and the witch of envy are different. Two separate personalities.
- Subaru is the one who saved Satella but also potentially a guy named Flugel.
- Subaru is the leading star of pleiades.

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