"Hello? Are you alright? I ask the professor if I could see you again.
There's not much time... I wanted to tell you, I mean apologize. I did treat you miserably, didn't want you to go on. They hurt deeply. I couldn't tell you, could I? I do have plans of my own, and you do have problems.
I want you to do a favor for me. A big, big favor. I want you to leave right now. Stay far away from me and don't come near me again. We're not going to get involved. Last night was last night and it's all there was and that's all there is. There isn't going to be anything more between us. So please, goodbye, good luck, no conversation, just leave."