I'm curious on why are you so concerned? Obviously, this person was your friend along the way for you to know this information n was just wondering on why would you consider getting them into trouble? (Your asking, your considering.)
I honestly am not trying to be mean but I wonder what goes thru people's minds on this. Why would you get into their mess? It's like for example, you see someone go thru line at your local store. The cashier doesn't see the bottom of the cart ahead of you, and the person doesn't point it out. However, the woman BEHIND YOU, the Helpful Hannah, yells out,'oh! You forgot your soda!'
Then it's Helpful Hannah's turn in line a few days later, she's in a hurry, and same thing happens to her, however, no one points it out. She gets to her car, and 9 times outta 10, she does not run back inside to pay for the soda or whatever the clerk 'forgot' to ring up. She's in a hurry n is late picking up her abusive husband from work, and if she's late again, he's going to punch her in the face again.
What goes around comes around.
Quit being jealous, live your life, don't worry about them. And if your were their friend, they have waaaay more to worry about you throwing them under the bus.
I'm sure your a wonderful person, but just think first. You can't take that back. ;)