She chose to tell me

The texts.
The giggles.
I look curiously at her.
Sure...it's great to that in love with your husband, but she has never acted this way before.
(We have known each other a long time...I know exactly how each one of them is.)
Our other 2 friends are oblivious, but not me... I see something more.

When we get a second alone, I lean over to see her most recent text.
She leans away to hide it and then shows me anyways.

I look at her and narrow my eyes.
"That isn't J's number." ???
It was more of a statement than it was a question.

It's not.
Without any prodding, she reveals that she has had an affair.
I ask her, "Why? Have there been problems in your marriage?"
"That's the kicker, there hasn't."

I know that is a lie.
Cheating doesn't happen when things are perfect.
I should know.
I thought things were perfect when my ex cheated.
Obviously they were perfect for me, not him.

I can't bring myself to say anything more.
I want to bitch slap her! I want to ask her, 'What the Hell was she thinking?"
But I don't.
It's not my place.

I tell her she needs to think this through, for her kids...for her husband.
She says it's all good.

But I know better.

...I'm just not sure why she chose to tell me.