Because you kept ignoring it. It's not all that common doesn't justify anything. To quote you, just because you've heard of understanding wives does not mean my example does not exist.

These stories end with the people separating and the guy does off to find himself and be happier. The two people involved usually remain friends too. But no lets focus on the stories where the partner cheats cause thats the only way it can go down.

It's still very sad for the woman.

I'm not treating it like a big dark secret, i'm treating it as a part of life. Someone might be out, someone might not and i just don't feel entitled to know who's out and who isn't.

You say it's a part of life, then diminish those who come out more than once or to people who might be casual friends or co-workers.

But i'm not private or in the closet, i'm simply not making it a big deal. I'm not going to shout it from the top of the rooftops "hey i'm bisexual and i have a girlfriend" i'll just have a girlfriend and if introducing her or being asked i'll mention it but i'm not going to act like it's a big deal, people get into relationships all the time.

First of all, where did I say you are supposed to shout it from the rooftops? That's an assumption you continue to make. If that is what you're doing, then that isn't refusing to come out.