Do Women Keep A Spare Tire ? [THE SCENARIO]

THIS IS AN EMAIL I GOT FROM A MALE LISTENER THAT WANTED ME TO PUT THIS OUT HERE FOR HIM
I grew up amongst a lot of women and I have dealt with women from various different backgrounds. My sisters when I was growing up would handle different guys in different ways. My current girlfriend always seems to keep a male friend, whether it is a friend she works with or some guy she hangs out with time to time. I call the men spare tires because if anything goes wrong between us two, that is who she is going to run to ? A guy she can break the glass for in the case of an emergency. I'm a man so I know how the game is played, but honestly I'm tired of playing it. Is it okay for my significant other to have a spare tire/man on the side ?