the usual, ordinary

勝手にしろ: go to hell!, have it your way!

go to hell!, have it your way!, whatever!

always, invariably, all the time / usually / (with a negative verb) never

勝手に: selfishly; for one's convenience; wilfully, as one pleases

action; behavior

to act

oneself / first-person pronoun: I, me (often shows the speaker's lower position in a hierarchy than the addressee) / (Kansai) you

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend