Last year I got really close to a guy in my Spanish class and I started to like him. He was in an on and off relationship with a girl at the time, so nothing ever came of it, despite the fact we both liked each other. We haven't talked in a while but recently he saw me and said hello and we have a lot of awkward eye contact. He's been single for a while now, and I was planning on sending him a message on Facebook since we are friends. What's the most appropriate way to message him?