Jesy and Sean have been seen together in public – with photographs circulating of the couple with their arms around each other.
Chris is reportedly envious of his top-ranked ex after their split shortly after the reality TV star dishonored herself at the National Television Awards by attacking a photographer in January.
A source told The Sun on Sunday: “Chris was really in love with Jesy and wanted it to work.
“He thought they were going to be together forever, so seeing pictures of her with Sean’s arms on her bare skin, looking warm and relaxed, was a tough pill to swallow. It’s empty.
“He knows that Sean and Jesy have become more friendly and started hanging out shortly after they split.
“The breakups are tough enough, so with the lockdown too it was doubly difficult for him.
Chris and Jesy were first linked at the end of 2018 before going their separate ways in April this year after 16 months of passion.
Last month, Jesy was linked with Our Girl actor Sean – and the duo looked relaxed together in London.
A spokesperson for the singer has dismissed speculation that romance could blossom.
They told The Sun, “Jesy has categorically denied that she is dating Sean Sagar and states that they are just friends.”
Meanwhile, Chris himself hinted that he was struggling to get over Jesy during a conversation with Vicky Pattinson on his podcast The Secret To…
He confessed, “Everyone says time is a healer, and you don’t believe it right now. I don’t think I’ve ever been heartbroken before. Friends have told me that over time everything will be fine and you have to accept it.