What is the brutal truth about a third marriage?

That it is likely going to end in divorce. 

https://www.psychologytoday.com/us/blog/the-intelligent-divorce/201202/the-high-failure-rate-second-and-third-marriages 

Utah Family Law, LC | divorceutah.com | 801-466-9277  

https://www.quora.com/What-is-the-brutal-truth-about-a-third-marriage/answer/Eric-Johnson-311?prompt_topic_bio=1