Personally I think title should follow the main language of the song so if we look at the lyrics:
- "Mon homme sweet homme Il faudrait faire…)
- “S’enroule avec mon mobile homme…”
They are song in a french with french words, only sweet is english but that s the only english word used.
Regarding “Aïe love you” it is english but in a middle of french lyrics and this expression “love you” could be seen as international now in a similar way than latin Title capitalizations for latin expressions in english
So i will tend to keep french capitalization for all three