Blunt reply: be a doormat for the rest of your life, or grow a pair and be a man.
You don’t have to kick her out, but at least start by laying down some ground rules for her to stay in your house.
Number one; she’s 24, no running around after her.
number two; she’s 24, no running around after her.
number three; shes’ 24, no running around after her…