The Big Brother star, 26, ended her relationship with Tweed by telephone last week. He has now left the home that they shared in Upshire, Essex.
Jade stood by Jack, 20, when he was accused of being unfaithful on numerous occasions during their two-and-a-half year relationship. However, pals have claimed that she was not prepared to put up with his wayward behaviour for any longer.
"Jade is devastated, and she's been in floods of tears," a friend told the Sunday Mirror. "But now she realises she's got to be strong and move on with her life.
"No one thing has caused this, it's just that Jack has been accused of cheating so many times Jade doesn't know what to believe."