I(30f) found out my husband (33m) got a message from an ex-gf a couple weeks ago in insta. We've been together 9 years so this was an ex from over 10 years ago.

We also have given each other permission to go through the others phones and have our fingerprints stored. I found out that she sent him a very suggestive photo of her (fully clothed but all the anatomy visible), claiming that HER ex sent the photo.

"Omg look what my ex sent me!" "INSERT NSFW PHOTO HERE" "LOL so weird right? Haha"

After confronting my husband about his inappropriate messaging, I found out she knew he was married and she ALSO is engaged. She also messaged my husband on her business insta and not her main but it was easy enough to find her FB and then her fiancé's FB. So...WIBTA if I messaged him what his fiancé sent my husband and let him know what she's been doing on the business account?