I make up time limits in my head...
“If he doesn't call me before 7pm, he doesn't want me.”
“If it takes him a day to respond, he really has found someone new.”
“If I have one more sleepless night because of him, I don't talk to him for a week.”

The limits never turn out
I still have hope
Even though I'm desperately in love with you
and to you I'm just the kid sister of a friend you used to know