As per the comment about the book above, "she would use in front of him".
In any case, using drugs is something people do. Whether famous or not. Famous people, in fast paced professions, dealing with fame, use them 10x more.
People also cheat or end relationships and go with another person, often younger. Not even in small numbers, even above 50% of marriages end like that. Passion fades, another person might reignite the joy of love.
It is what is is. Nothing especially bad as far as things people do is concerned, except if one thinks like some kind of prude.
