Trust

Had a short conversation with friends lately about men.

Here're the stories.

#1: Doting Dad.
My friend was on business trip to Switzerland.
She attended a night out with a group of colleagues, mostly men (Note: and one new daddy who claimed to be eager to return home to see baby), to celebrate a birthday party.
And so the guys decided to check out a carbaret (aka our KTV night club).

Within minutes, girls throttered in, accompanying all those men, even including my girlfriend.

When the night ended, the doting dad was said to have brought one of the girls into his hotel room.

Doting Dad but Unfaithful Husband.

#2: 10year longterm doting boyfriend turned liar.

10years of relationship. Doting boyfriend who sees the girlfriend everyday.
Wedding was natural.

Nearing the wedding date, the boyfriend said he didn't want to marry so soon. Girlfriend thought it was just wedding jitters. Nonetheless, they decided to proceed with the wedding, as all invites were already sent and all preparations complete. But all would be a 'scam', as it will not be a legal wedding registration. The girlfriend had trusted that he would be ready and marry her officially someday.

It turned out that the boyfriend had a change of heart. A colleague he met at work.
And he ran away with the red packet money from the wedding.

Sounds so drama right?

But it's real life, my friends.

So just how many men are really loyal forever to their ONE partner?
What is the proportion? Can someone tell me?

I wish to have a standard formula.