It's always so fascinating to me when people get divorced, only to not quite be able to move on and disentangle themselves. How would you feel if your best friend decided to sleep with their cheating ex-spouse, who was already married to someone else?

This 31-year-old woman has a 40-year-old best friend named Will, and they have been sidekicks for the last six or seven years. Since they're so close, she's gotten a front-row seat to the most poisonous romantic relationship she has ever seen in her life.

"A quick history on the dynamic: Both my friend and his ex are deeply religious people, and it honestly makes what happened even more upsetting. Will and his ex, [whom] we will call Katie (41), were married for about 11 years," she explained.

"In that time, she would leave diary entries around for him to find, saying she regretted marrying him and [wished] she had married someone else. Then, on several occasions, she had multiple affairs with different people."

"He forgave her each time, believing that he was the one at fault. She ended up divorcing him and married another man 6 months later. Then divorced that man after a year and then jumped into a relationship with her current husband."

Despite Katie stabbing Will in the back, he's still been supportive of her. She's attempted to prove to Will that Katie is only using him, but he doesn't get it.

He loves Katie with all his heart, and he's a wonderful guy. When Katie asks him to babysit her six kids (2 of whom are Will's), he instantly rushes to do it.

Will also helps Katie complete projects around her house, serves as her shoulder to cry on, and even bought her a brand-new car. For a while, she did wonder if Will was doing this to benefit his children.

But in the last year, the dynamic has changed, and Katie began whining about her husband to Will and said he wasn't making her happy in the bedroom.

Smiling woman portraitMinerva Studio - stock.adobe.com - illustrative purposes only, not the actual person

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"Will started to go over to her house every day, and she seemed to be openly flirting with him. Yes, even in front of her current husband," she added.

"She then started saying she made the wrong choice and should have never divorced him, and how much she loved him. But refused to leave her current husband because he makes too much money, and [she] gets to be a stay-at-home mom."

"She would also joke about having a polyamorous relationship between all 3 of them or that her husband would die early so that they could remarry."

One of the friends that she and Will share warned him that he's having an emotional affair with Katie and had to pull back from her.

Will got defensive and denied it all the way while promising to never cross a line. Well, last week, Katie really started pursuing Will after her husband wound up needing surgery.

One morning, Katie dropped the kids off at school and went right over to Will's house. She didn't leave until she successfully seduced him.

"She told him that she was his biblical wife since they were married to each other first and that this wasn't an affair but was his right as her first husband," she said.

"Now they are both freaking out because they were so caught up in the moment, they failed to use protection. Katie's husband was cheated on in his last relationship and has told her if she ever cheats, he will leave her and take everything."

Oh, and Katie's husband got snipped, so if Katie ends up pregnant, he's going to know the baby is not his. She's so angry at Will, because she's watched Katie prey on him for years, and all of Katie's kids are going to end up with their lives shattered all over again, considering Katie is wrecking her marriage and their chance at stability.

She's done with Will because he knows Katie used him to get what she wanted, but he somehow feels the need to keep making sacrifices for her.

She was so mad that she almost cut Will out of her life when she found out that he slept with Katie. She hates cheaters and literally informed Will that they can no longer be friends.

"He begged me not to and [said] that he really needed a friend right now. Our other friends haven't spoken to him after hearing what they did, and I'm not [going to] lie, I felt bad for him," she continued.

"But with him going back and forth over defending what she did to realizing she is a truly toxic person. I'm not even involved, but just hearing about it is stressing me out."

"I will update when Katie either tells her husband or if more information comes up. She has said she will tell her husband this week, but I honestly think she is going to wait and find out if she is pregnant first."

It is hard to maintain a friendship with someone who is doing something harmful and wrong, and man, is Will ever desperate. I think she should tell Katie's unsuspecting husband, even though it means her kids are going to suffer from another broken home.

That poor man deserves to know what his wife is up to. And honestly, it's perfectly acceptable for her to no longer want to be as close to Will, considering his actions.

What advice do you have for her?

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