His ex-girlfriend Lisa

His ex-girlfriend Lisa and Matt the backstabber ex-friend. They were walking in his direction so Nick started to hide his face but realized that it wasn't his face and neither of them knew Megan. Nick smiled and made eye contact with Matt.
Matt smiled back.
A thought occurred to Nick and he called out "Lisa, Matt, long time no see. It's me Nicole!"
Lisa and Matt looked confused for a moment but being recognized assumed they were at fault.