According to the Daily Sun, Mohale was seen cozying up to a young man, identified as Vuyo Pan, at his 24th birthday dinner in Fourways, North of Johannesburg, two weeks ago.
Mohale's party was held at the Palazzo Hotel and Somizi, who is 21 years older than Mohale, was not in attendance.
Sources went on record to say that Mohale reportedly made the first move and set up meetings with the 19-year-old Vuyo, claiming it was about business and work opportunities.
Daily Sun claims that Vuyo also confirmed that he had received message from Somizi.
"Mohale invited me to dinner and my fiancé of three years dropped me off there. I was shocked to find out that Somizi wasn't there. After the dinner ... I started getting threatening messages from Somizi," he told Daily Sun.
Vuyo went on to add that he has stopped contacting Mohale and does not understand why he is being attacked when he is not the one making the moves.
Neither Somizi or Mohale have directly commented on the allegations, however, the "Idols SA" judge took to Instagram on Sunday to share a picture him and his partner, with a captioned: "AND THEN WHAT? NIT VIR DIE DING. HAMONATE JWANG. By the great ROSALIA".