Um. This song doesn not mean "she can be strong on her own with out some bad boy."
"Be my bad boy, be my man. Be my WEEKEND LOVER BUT DON'T BE MY FRIEND. You can be my bad boy, but understand that I don't need you again."
This song means she's been hurt and screwed over too many times to deal with relationships anymore. She just wants a man to have s** with and once that's done, it's over. No strings attached.