my 'of course I'm not gay' ex went straight from straight to asexual. But before that, before he even met me, he was gay for long enough to try a relationship with a man. He went from that to a bisexual woman. Neither of them knew about the other initially, they lasted 3 years. They both went on to marry unknowing straights. oh weren't we lucky.
my ex's attempt at a relationship with a man ended up with a suicide attempt. he said several times that he was depressed as a teenager. So I guess it's not all beer and skittles being a bisexual - being depressed is really hard, I didn't know what it was like, I didn't experience it myself until I'd spent my youth married to him.