When I went OTD it was mainly because of some ad experiences I had. It started with some bad things that happened to me that came from the top guys in the yeshiva. I spoke to the Rosh Yeshiva about it, and asked him, how am I supposed to emulate these guys when their middos are terrible, and all they do is make me miserable? He told me to separate the learning from the behavior. I asked him if they had their behavior ignored because of their learning, and I was rebuked for even asking that. At that point, I decided I had no interest in sitting and learning. I didn’t enjoy it anyway, but I’d been making the effort. After that, I didn’t even make the effort anymore.
When I decided to leave Yeshiva and go to college, the Rosh Yeshiva tried to talk me out of it. He told me that someone in college could never stay frum, and I couldn’t be a good Jew if I was in college, even in Touro. Well, I decided that if I couldn’t be a good Jew anyway, I might as well enjoy myself. So I decided not to be frum anymore.