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The Good American found out late last year that she was expecting her second child via surrogate, but Kardashian's excitement was quickly muted by news Thompson had also fathered a child with another woman.
"When Khloé found out in December that the surrogate was pregnant, she was elated," a source tells PEOPLE. "Shortly after though, Tristan's new cheating was exposed. It was a bittersweet situation for Khloé."
Adds the source, "She was so excited about the baby, but incredibly disappointed in Tristan. Like Khloé always does though, she turned it around and focused on the good."
In December, it was revealed that Thompson fathered another child with a woman named Maralee Nichols. The child, named Theo, was born on Dec. 1, and Thompson confirmed he was the father in January. Thompson, 31, was in a relationship with Kardashian, 38, when the child was conceived.
SHEIN X 100K Challenge 2021/Getty; Jack Arent/NBAE via Getty Tristan Thompson and Khloé Kardashian
Thompson apologized in an Instagram statement: "Khloé, you don't deserve this. You don't deserve the heartache and humiliation I have caused you."
He continued, "You don't deserve the way I have treated you over the years. My actions certainly have not lined up with the way I view you. I have the utmost respect and love for you. Regardless of what you may think. Again, I am so incredibly sorry."
Tristan Thompson/Instagram Khloé Kardashian and Tristan Thompson with True
Now, "Khloe and Tristan are not together," the source says, "but they will always be a family. However, they were together when their surrogate got pregnant."
Khloé recently reflected on the paternity scandal and watching the Hulu episode in which it was featured. "It's not easy," she admitted, "but it's also, I think, a form of therapy for me at the same time, and I like to see how the rest of my family responds to things."
She added, "Those little things mean a lot to me, and I like to see that stuff, just how the whole family — not about this situation, but any situation — how we all rally around one another in times that are hard for us."