I had a roommate in college who was gay. I found out by hearing him talk about it with a friend. I was somewhat surprised to learn that he was gay, and he was surprised to learn that I didn't already know. At the time I was still in denial of my own sexuality. Our relationship didn't change better or worse afterwards. There were two people who I had met before that who weren't out at the time I met them. One was the mother of a childhood friend of mine who my mom ran into years later and she told my mom that she divorced her husband and was in a relationship with a woman. The other was the granddaughter of friend of my dad's. She was only about 10 when I first met her, and later as a teen she came out.