They started dating on May 20, 2011.
On March 27, 2012, Shane Harper said in an interview to Akash Sharma of Officially The Hottest for the first time that he was dating Mendler. Harper told they became friends early in Good Luck Charlie and began dating in 2011, but they decided not to reveal so far. In an interview with Cambio in September 2012, Mendler stated that it took two years between her meeting Harper and beginning to date him. She said "It wasn't one of those... 'you meet on a set and you wind up dating instantly,' it took like two years". In March 2013, Mendler said in an interview to Sarah Bull of Daily Mail that the fact her boyfriend in real-life is also her boyfriend on hit show Good Luck Charlie doesn't disturb the relationship: "I think it makes it easier, especially when it’s a person who you’ve worked with for a long time".