have somebody’s interests at heart

US /hæv ˈsʌmˌbɑdiz ˈɪntrəsts æt hɑrt/
UK /hæv ˈsʌmˌbɑdiz ˈɪntrəsts æt hɑrt/
"have somebody’s interests at heart" picture
1.

to care about someone and want to help them in any way you can

:
I know she always has my interests at heart, even when she's being tough.
A good leader should always have their team's interests at heart.