It's hard to believe it's been almost one year since Teen Mom 2 stars Kailyn Lowry and Javi Marroquin announced they would split after four years of marriage — however, there is still one question on everyone's mind, why did Kailyn Lowry and Javi divorce?

In Touch exclusively revealed before the announcement that their union was "rocked by cheating claims" — which the blonde beauty seemingly admitted to during a recent episode of the MTV reality series.

“They were already having trouble, now Kailyn believes Javi cheated with a woman he’s been hanging out with,” said a source. “It’s definitely over. It’s sad, but it looks like they could wind up in a nasty custody battle [over their three-year-old son, Lincoln]."

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Aside from cheating, the pregnant reality star further opened up about what led to their split in her memoir titled Hustle & Heart.

MORE: Pregnant Kailyn Lowry Shares a Baby Gender Update

"When he did things like demanding that I unlock my phone to prove I had nothing to hide, or calling me constantly when I was enjoying time with friends to make sure I wasn’t doing anything ‘sneaky’ behind his back, it became clearer and clearer how little my husband trusted me,” she recalled.

“I had done nothing to make him doubt me. I never lied, never went behind his back and I was never unfaithful. For some reason, he was convinced otherwise.”

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Finally, another aspect that led to the demise of Kailyn and Javi's marriage was the way he handled their unfortunate miscarriage. The United States Air Force member seemingly blamed his then-wife for losing their baby — which he has since apologized for — though she still quipped that he was neither "helpful or sympathetic" during the heartbreaking tragedy.

Javi briefly moved on from their split with Kail lookalike Cassie Bucka and is now hoping to find love on a dating reality show. Kailyn has also moved on and is expecting her third baby this summer — though it is still unclear who the baby daddy is this time around.

Scroll through the gallery to find out more about their relationship!