Chris Evans is reportedly being "cautious" in his romance with Minka Kelly.

The two stars first began dating in 2007, with Minka apparently ending things shortly before she stepped out with baseball star Derek Jeter.

Avengers Assemble star Chris and the actress have now decided to give things another go, but he is treading carefully.

"He's still a little insecure, so he's being cautious," an insider told Us Weekly.

They have been spotted enjoying several dates recently, including a musical in New York City last month.

It was apparently Minka who started the ball rolling, after she realised Chris is her perfect partner.

"She did a number on him back [when they first dated]," another source claimed. "But she reached out to Chris this time."

Minka and Derek first split last year, although they briefly rekindled their romance in March.

Soon after their initial break-up, it was claimed the 32-year-old actress hoped to seek solace with Chris, 31.

"She is the type of girl who likes having a boyfriend, and she thinks the second time around will be better with her and Chris," an insider said at the time.

Minka was also linked to Wilmer Valderrama earlier this year.