my girlfriend moved out this weekend( after 6 months)--because I have one bathroom..and my son is coming home

We went around and around and she finally decided to move back to her condo. My son completed basic and is on leave for 4 weeks..and she didn't like the idea of being here..I think I will have to cut her loose since this is very common for your children to come home unexpectedly sometimes..Can't say no.. WE are not going to get married, so I think now is a good time to end it.