Quick background: Taught a class today for 30min for a local program, will be coming once a week for next couple weeks and today was first time. Substitute teacher was in room when I started and I said hi and introduced myself, she introduced herself and said I was good to start. No other small talk. As I was teaching my lesson, Sub left when regular teacher returned and sub asked "can I leave this (folded note) for you in your bag". I said yes, not thinking, and continued with lesson. When leaving school, remember note and open it to find her name and number.
I am committed to a long term girlfriend and would not be interested in this woman even if I was single. Still, took a lot of courage to leave me number. Also since she is sub, may never see her again in that class.
How do I proceed?
A.) Never acknowledge I received it
B.) Tell her thanks I'm flattered but sorry I'm in a relationship
C.) Other