The TOWIE star is expecting a baby with EastEnders actress Jacqueline in February but posted a cryptic tweet last night suggesting they may have broken up.
Taking to Twitter, Dan told his followers: "Relationships just do not seem to work.." Alongside his statement, he posted a 'thumbs down' emoticon and a miserable-looking face.
Although Dan didn't specify what relationship he was talking about, fans have been left wondering if he was referring to his romance with Jacqueline.
One told him: "@DannyO you have to make it work, she's having your baby!! Perfect family." Another simply said: "I HOPE YOU DONT BREAK UP."
Reality star Dan began dating Jacqueline last year, however it emerged he was expecting a baby with his ex-girlfriend and the couple soon split. Dan and his ex went on to welcome son Teddy in December.
In June, rumours began circulating that he and Jacqueline had rekindled their romance and by August they had announced their pregnancy news, saying they were "thrilled".
Since then, Jacqueline has kept fans updated with pictures and news of her baby bump and the couple have even found out the sex of their unborn child.
A fortnight ago Dan and Jacqueline were all smiles as they enjoyed a night out together at a showbiz launch in London.
Reveal contacted Dan's rep but he had no comment to make. Meanwhile, Jacqueline has not responded to the TOWIE star's cryptic tweet.
Jacqueline Jossa: Her pregnancy in pictures
Copyright: Instagram jacjossa