Terming it as "sad", Dikshit said Lovely got political "honour and respect" from the grand old party and was not only a minister but also the party's Delhi chief.
"Its a sad news. He got political honour and respect from Congress and was not only a minister but was also made Delhi Pradesh Congress Committee (DPCC) president.
"He has left Congress when its days are not as pleasant as they used to be once. I think this a betrayal," Dikshit told a news channel.
A key minister in the erstwhile Dikshit government in Delhi, Lovely raked up allegations of bribery in ticket distribution for the MCD polls by the Congress and claimed after meeting BJP chief Amit Shah that many senior Congress leaders are feeling "suffocated" as the party is no longer what it used to be.
Lovely, who hails from the Sikh community, joined the saffron party along with Delhi Youth Congress chief Amit Malik.