AceShowbiz -

Kylie Jenner may be enjoying her blooming romance with PARTYNEXTDOOR, but at least one person is not happy with their relationship and he's none other than Kylie's former boyfriend Tyga. The Compton-born rapper who is apparently upset that his ex has moved on with another guy has been accusing her of cheating on him with PARTYNEXTDOOR.

The accusation is, of course, baseless since Kylie and Tyga had broken up before she started hanging out with PARTYNEXTDOOR. "Tyga doesn't have a good memory because when Kylie connected with PARTYNEXTDOOR, they were done," a source tells HollywoodLife.com. "Kylie's not like Tyga when it comes to breaking up. There's no ambiguity or blurred lines. They were done! Kylie doesn't believe in cheating and stepping out when she's in a relationship."

It's also ridiculous that Tyga claimed Kylie cheated on him while it was previously reported that they broke up because he cheated on the 18-year-old reality TV star. "Tyga's hurt. He's trying to trash Kylie's name and brand by saying she's a cheater," the source adds.

Another source tells Radar Online, "Tyga is telling people that Kylie was the one cheating! Tyga flipped out on Kylie after he found out that she was hooking up with PartyNextDoor. He accused her of cheating on him while they were still together."

Kylie insists that they're completely done and she wants to cut all ties with Tyga. "Kylie now has Tyga blocked and unfriended pretty much everywhere," the source says. "She even told the guards at her community in Calabasas to never let Tyga in for any reason!"

Her sisters reportedly have no problem with Kylie getting close with Canadian rapper PARTYNEXTDOOR. The so-called pal claims, "They know that Party is a rebound from Tyga, but they do not care. As long as she is not with Tyga they are all happy!"