The recently married couple Ashton Kutcher and Mila Kunis are reportedly calling it quits after rumors emerged that Kunis is afraid of Kutcher cheating once again.

Cheating and trust issues have been cited as two of the main reasons that allegedly forced "Friends with Benefits" star and "No Strings Attached" star in splitting. It was reported that Kunis deliberately goes back to Kutcher's cheating past while he was still married to "Indecent Proposal" star Demi Moore.

"Mila knew that he'd cheated on Demi, and in fact, he was confiding in Mila while all that was going on," a source told OK! via HollywoodLife.

According to OK! as reported by Gossip Cop, Kunis and Kutcher are having their "worst fight ever" after the actress has been totally paranoid over Kutcher's cheating past; it reached to the point that she has been "reading his emails" and has been spying him all the time. The report's insider added that the couple are arguing non-stop

"He's told her that if she can't trust him, they can't be together," the insider told OK! "It doesn't help that they don't have the passion they did in the beginning of their relationship."

Another reason that has been cited is that Kutcher reportedly wants a sibling for their 1-year-old daughter, Wyatt, and this has been what's offered to Kunis as an ultimatum in order to save their relationship.

In another report by HollywoodLife, a tipster said that Kutcher wants a big family and he wanted to have "back-to-back" babies. However, Kunis declined and said that they would have to wait longer to get Wyatt a sibling because pregnancy is a tough job. "She says that being pregnant was more difficult and all-consuming than she expected," the insider added.

"He's even given her an ultimatum. He said he feels lied to and told her that she's got to stop spying on him and start talking about having another kid or else," the source continued. "Mila, meanwhile, really wants to be able to trust him -- but she has no idea what's next for them."

While all the allegations that OK! has spilled point out that the two are soon to end their 110-day marriage, an insider close to the couple told Gossip Cop said the split rumors are not "100 percent untrue." However, the two are still to give their official statement regarding their relationship.

Kunis and Kutcher has known each other for 16 years after meeting in "That '70s Show" and in the spring of 2012, the two started dating. In September 2014, Kunis gave birth to their first baby.