Translation:Who knows what I would have become without him?
when "lui" is before the verb, it can be used fr both male and female: "je lui ai demande" = I asked him/ I asked her
When it is after the verbe it is male only: "je demande ma route sans lui" = I ask for directions without him. "je demande ma route sans elle" = I ask for directions without her.
In French, we make the distinction when the "lui" is the recipient of the action (called COI or complement d'objet indirect) and when it is used for something different.
I asked Helen (whom) for directions (what) = I asked her for directions = Je lui (whom/COI) ai demande ma route (what/COD) = J'ai demande ma route a Helen the "a Helen" is the COI, the recipient of the action...