It seems Blake Shelton may have a thing or two to learn about karma himself.

Last week, Shelton caused an uproar when he sent a cryptic tweet about "karma" just as reports claimed that his ex-wife Miranda Lambert was dating a married man.

"Been taking the high road for a long time.. I almost gave up. But I can finally see something on the horizon up there!! Wait!! Could it be?! Yep!! It’s karma!!" Shelton tweeted after multiple outlets reported Lambert began dating married Turnpike Troubadours front man, Evan Felker.

Evan Felker reportedly began dating Miranda Lambert while he was married. (Getty)

But according to Lambert's ex-boyfriend Jeff Allen, Shelton is not as innocent as he's trying to seem.

Allen tweeted and deleted a post calling out Shelton for romancing Allen's then-girlfriend Lambert while Shelton was still married to his first wife, Kaynette Williams, in 2006.

"You know, I’ve always given you the benefit of the doubt and chalked it up to just being human, but you must be one arrogant SOB to pop off something like this, when I know damn good and well you were cheating on your wife and Miranda was cheating on me when you two started up," Allen wrote in a since-deleted tweet, according to Us Weekly.

Jeff Allen dated Miranda Lambert for three years before she got together with Blake Shelton. (Facebook via Jeff Allen)

"I kept my mouth shut for 13 years. Sorry, his karma tweet rubbed me wrong. All of this is pointless," he added.

Allen told RadarOnline.com, "I’m sure Miranda did [Blake] dirty just like she did me, but he wasn’t thinking about me when he was cheating with her, so I don’t know why he thinks it's karma."

He added that he does not harbor bad feelings toward Lambert and said she "was a loving, caring person and a good girlfriend."

Reps for Lambert and Shelton did not return Fox News' requests for comment.

It's been reported that Lambert and Shelton's romance began as an affair but both singers have denied this in the past. They became engaged in May 2010 and married a year later in Texas. The country singers announced their divorce after four years of marriage in July 2015.

The "Tin Man" singer, who recently ended things with her boyfriend of two years, Anderson East, reportedly began seeing Felker when his band joined Lambert's "Livin’ Like Hippies" tour in January.

Felker married global strategist Staci Nelson in September 2016. The singer filed for divorce on Feb. 16 while Nelson filed 12 days later.

Nelson, who still goes by her married name on social media, shared a tearful selfie on Thursday with the caption, "PSA: If Staci Felker can make it through this week, so can you."