A Caged Bird Set Free

I've been with Evan Zimmerman for one and a half years. I care for him when he's drunk, entertain guests on his behalf, and I'm at his beck and call. I do everything he asks of me, yet he summons and dismisses me at his fancy.It's too bad he ultimately abandons me.I quickly regroup and start afresh. That's when he asks me whether I want to be with him again. This time, he'll give me a proper identity.