Kailyn Lowry is Bisexual- Why Keep that a Secret?

So, articles have come out recently saying that Kailyn Lowry is bisexual and had dated girls and even lived with a girlfriend before dating her baby daddy, Jo Rivera. Not only that, but she cheated on Jo with a girl. That wouldn't have been the only time she cheated, since she cheated on her ex-boyfriend Jordan with her child's father Jo.

Apparently Kail had a whole 2 year long relationship with a girl, which is more than just a fling. According to the articles she has 2 ex-girlfriends, one named Shelby and one named Gigi.

Apparently Jo knew Kailyn was bisexual and he didn't even care that she cheated on him with a girl.

My question is, if Kail is bisexual then why was that kept secret on MTV's Teen Mom 2? And does that have anything to do with the way her mom treats her? Kailyn's Mom is horrid on Teen Mom 2 and has even blocked her phone number, but it's unknown why Kail's mom hates her. Now it's come out that she is bisexual, I wonder if that could have something to do with it?

And can she stay faithful to her current husband Javi Marroquin or do they have an open marriage where he will allow her to see girls?