Kylie Jenner is rumored to be growing convinced that older rap star boyfriend Tyga may be too young for her.

According to In Touch magazine, the couple's suddenly shaky status has left the 18-year-old "Keeping Up With The Kardashians" reality show star wondering if they are truly meant to be over the long haul.

Earlier this week, Jenner is reported to have again been left feeling totally disrespected after her 25-year-old man admitted to speaking with ex-girlfriend and bitter Jenner/Kardashian rival Blac Chyna about the couple's mounting issues.

"Kylie was heated after learning that Tyga, once again, went behind her back and shared the details of their relationship with Blac [Chyna]," a source told Hollywood Life. "She didn't appreciate that, and felt it was crazy disrespectful."

Not to mention like that the "Rack City" rapper was acting less than his age. Overall, the last several weeks have been a challenging time for the once seemingly magical couple, with each of them being dogged by allegations of being unfaithful to the other.

In early August, transgender model Mia Isabella hinted about having engaged in a long-term, secret relationship with the rapper and threatened to release all the juicy the details.

"Funny how your team created a fake witch hunt so you looked [like] the victim, when in fact you're guilty, and I'm the victim," she posted. "Be careful of wolves playing sheep when they are guilty of disguising to get close enough to eat."

More recently, Miami-based rapper Stitches claimed he has sex and smoked cocaine with Jenner soon after she celebrated her 18th birthday.

"I did cocaine with Kylie and then slept with her -- while she was in a relationship with Tyga," he said, while adding the teen didn't seem the least bit remorseful. "I had sex with her: We did it all."