Homosexual? Gay? Same-Sex Attraction?

It is pretty common today to find someone relatively close to you "declare" themselves gay. I have a close family friend, and as he was growing up was extremely musically gifted. He played the piano with magnificence and grace. At one point he was an apprentice to the director of the Mormon
Tabernacle Choir. During high school he went on plenty of dates and had plenty of friends, but at home his family life didn't seem so "put together." Eventually one thing led to another and it was time for him to serve a mission and he bolted. He moved out and started acting on same-sex attraction. To this day I infer that he wasn't getting the recognition and attention he deserved with all of the ridicule and judgment being placed on him even when he was, from an outsiders view, "good." I don't know what persuaded this and I'm not even sure if his family knows. Why do you think he decided to change like this? What do you think pushed him to this point? All I know is it was very unexpected.