What does it mean when a guy nods his head saying hi and then looks down?

[Anonymous]

This guy I know who works at a store I shop at saw me today and he nodded his head hi. And then he looked down as I was leaving he said have a beautiful night I said you too.

(he and I slept together awhile ago)

[spartan55]

You again. Just can't get over this guy can you? What does it mean? It means he has a girlfriend and to forget it.

[Jltakk]

I literally do the same out of habit. I hate eye contact. but also say hi or give others a thumbs-up awkwardly

[Asker]

He has made eye contact with me before.