Go back and strive to be curious about his heart (7)
I believe the answer is:
revisit
'go back' is the definition.
(revisiting is a kind of going back)
'strive to be curious about his heart' is the wordplay.
'to be curious' is an anagram indicator.
'about' indicates putting letters inside.
'heart' says to take the centre.
The middle of 'his' is 'i'.
'strive' is an anagram of 'revsit'.
'revsit' placed around 'i' is 'REVISIT'.
'and' is the link.
(Other definitions for revisit that I've seen before include "comeback?" , "Pay further call" , "Go back to (place)" , "making further call!" , "coming to call back?" .)