This is the 15065th most frequent Turkish word.
sevdiğini
"The one whom (someone) loves."
In this sentence, 'sevdiğini' refers to the apple which is liked.
Elmanın sevdiğini söyledin.
You said that you like the apple.
Here, 'sevdiğini' refers to the thing/person that is loved.
Sana sevdiğini söylemedi.
He/she did not tell you what he/she loves.
In this case, 'sevdiğini' expresses what/who you love.