What's "cool" mean here? It's not referring to a cold temperature, yeah?

Native speaker’s answer
Rebecca
You're right! It's not about the temperature. "We're cool" means "we're okay. There is no misunderstanding between us." Ex: They were past lovers, but they've moved on, and everything is cool between them. Ex: We are not cool these days. I found out that she was lying to me for the past 3 weeks.