C118 Cumbersome relation(3)

I didn't expect my phone to ring at this moment. It was from my high school girlfriend, but it disappointed me when I opened the message. "Hi, I've been busy lately. Please leave a message."

What does this mean? This means that my plan might have been a bit too hasty, and I might have been a bit disappointed, but since I've already agreed to buy some stuff for Xiaoli