According to the Daily Star, Lowe is worried that the Doctor Who actor will cheat on her with groupies when they are apart.
"Girls literally throw themselves at him and it seriously winds her up," a source said.
“She’s banned Matt from hanging around with a girl friend called Anastacia who’s in a band and she’s asked him to sever ties with his sexy Brazilian ex-girlfriend Mayana Moura."
The insider added that the couple split briefly in May because of Lowe's insecurities.
“Daisy pulled the plug on their relationship after three months as she was sick of Matt hanging out in Camden with female fans. He would spend nights in the Hawley Arms surrounded by groupies and pretty girl friends.
“[She] couldn’t control her jealousy so finished with him."
Lowe allegedly gave Smith an ultimatum saying that the relationship could only continue if he stopped spending time with other women.
