Who's the Backup Now?

I was a backup for three different guys.Number one was my childhood best friend.He was still obsessed with his ex.Number two was an indie rock frontman.After sex, he lit a cigarette."We're still friends, yeah?"Number three was my CEO boss.He gave me a cold warning."Do not get any ideas. I only marry women from my social class."Then my mom made me go on dates.My childhood friend pulled out house keys. "I want to build a life with you."The frontman said, "I can't live without you.