Ramona Singer, 'Real Housewives of New York' Star Gets Scandalous Letter From Husband's Mistress

Ramona's going to need to get some pinot ready and sit down for this one.

It appears that her cheating husband's mistress has signed, sealed, and delivered an ultimatum letter to the star of the Real Housewives of New York.

In Touch magazine got a hold of the letter that Kasey Dexter (Mario's mistress) wrote to Ramona, and the two-page memo details the affair and lets Ramona know that if she doesn't leave Mario, than Kasey will.

"But I can't continue to have him dictate how to live my life. Every time I tell him I have to move on, he reminds me of how good our sex life is," a snippet of the letter reads. "I know you probably don't believe me, but I was under the impression that Mario was leaving you. The day you served him with divorce papers, he came to my apartment- which he was paying for- and took me to dinner. I love him, but do not want to continue to be involved unless you are out of his life. If not, I'm going to let him go. You and I have both suffered tremendously."

A screen shot of the letter that In Touch published in their magazine can be found here.

When Ramona learned about the affair she served husband, Mario with divorce papers, something that she later regretted doing. The pair have since called off the divorce and are currently working on their relationship, something which Dexter is making pretty hard for them to do.

The affair between Mario and Kasey began last summer and resulted in a pregnancy, which the pair decided to terminate. The couple continued to see each other until Ramona caught them together at the Hampton house, her and Mario share. The confrontation between Ramona and Mario turned physical and the cops were called, but luckily no one was hurt and no arrests were made.