Is it true that people tend to unite when they experience an external threat?

Yes

Especially guys and ladies

There was this guy I don't use to talk to. He was okay, I just want interested in him

So one night, robbers came to the neighborhood. They didn't come to my apartment building though but it didn't matter. I had issues sleeping alone in my room so I went to this guy's room.

That was how we bonded. Before then, he was just some random guy. I think when danger threatens people are more concerned about safety than maintaining social standards