My roommate’s mother is visiting for the first time. She meets my girlfriend.

Roommate’s Mother: “So, [Girlfriend], do you have any brothers or sisters?”

Girlfriend: “Yes, I have a younger sister here in town and an older brother who lives in Colombia.”

Roommate: “Get out! I never knew you had a brother.”

There’s a pause.

Me: “I never knew you had a brother!”

We later broke up. Lack of communication was a factor.