Yeah Simba will trust Kovu. They will have to live together and he
can't spend every single second keeping an eye on Kovu. If not, he
will atleast grow some-what fond of him someday.

yes of course because he said kovu i was wrong you belong
here see so he became friends and he will become king

Simba trusts Kovu enough to let Kovu be his son-in law . I'd
say they are definitely friends.

yeah when simba accepted the outsiders he had to trust them
so he trusts all of them not just kovu

he already does

yes!