I never had anybody "come out" to me though I've had plenty make note that they're gay.
OK, here's something for you. Roughly 40 years ago my parents split up and Mom moved in with a woman. 30 years ago, or so, Mom and her partner split up and Mom moved in with another woman. Mom has never "come out" to me, probably because she has no idea how I'd handle it. I didn't handle it particularly well 40 years ago but I never blamed her for anything. It was just more than a little difficult for me to explain to friends that Mom is gay. Heck, even today it's not easy for me to wrap my head around. Mom has always been a GREAT mother and she's always been supportive. She's a great sounding board for nearly every issue but homosexuality is, generally speaking, not a subject we discuss.
Your post makes me wonder if, perhaps, I should be the one to break the ice on the subject with her. My instincts tell me that she'll open up if and when she feels the need so, out of respect for her, I don't go there. Bottom line, she knows that I don't harbor any ill will toward anyone due to their sexuality and, maybe, that's enough for both of us.