“Love & Hip Hop: Atlanta” star K. Michelle took to Twitter Tuesday to charge that her boyfriend, Indiana Pacers star Lance Stephenson, has been cheating on her.

In a series of Twitter and Instagram posts, K. Michelle bashed her 23-year-old ex-boyfriend and announced that she is now single. The “Love & Hip Hop” star was dating Stephenson for the last several months, but recent rumors have suggested the Pacers star had been cheating on her with the mother of his young daughter.

“I’m single. I’ll explain later. I have to do what’s best for me,” K. Michelle wrote on Twitter. “If it doesn’t make you smile know when to walk away. There’s only so much a heart can take. No one deserves to be lied to and cheated on.” Stephenson has yet to respond to the accusations.

K. Michelle also commented on the situation on Instagram, posting a photo of the phrase, “Honesty is an expensive gift, so don’t expect it from cheap people" — an apparent reference to Stephenson. She captioned the photo: “Say that! I hate a liar!!! I can forgive a lot but a liar is a coward to me. I don’t respect a coward, so we can’t rock. If you gotta lie to do your dirt, you ain’t a real BOSS. A boss will hurt you with the truth before they tell you a lie.” The post received more than 25,000 likes.

Rumors of Stephenson’s alleged cheating began when the basketball player allegedly posted a picture of himself in bed with his mistress on Instagram, All Hip Hop reports. The picture was quickly deleted, but not before K. Michelle’s fans informed her of her boyfriend’s apparent misdeeds.

Although the cheating rumors began circulating more than a month ago, K. Michelle was initially unwilling to admit that she and Stephenson were breaking up, Bossip reported. When a fan asked the R&B singer on Monday if he could have Pacer, her dog, K. Michelle had an interesting response. “Ummm no my boyfriend bought my pupper Pacer, [Lance Stephenson] would be upset.” Just three days later, K. Michelle was single.

This isn’t the first time that K. Michelle has been involved in a nasty, public breakup. In August, the “Rebellious Soul” artist feuded with her then-boyfriend and “Love & Hip Hop: Atlanta” co-star, rapper Rasheeda, over allegations that he had been physically abusive toward her.

K. Michelle will star in “Love & Hip Hop: New York” starting in 2014.