for all I care
US /fɔːr ɔːl aɪ keər/
UK /fɔːr ɔːl aɪ keər/

1.
used to say that you do not care about something or someone
:
•
You can leave, for all I care.
•
He can complain all he wants, for all I care.
used to say that you do not care about something or someone