Erfrieren literally means "to freeze to death" or "to be frozen solid." It's a strong and evocative verb that goes beyond simply being cold.
In the song, Samra uses it to describe an intense emotional state: "Manchmal bin ich nicht ich selber, bin so kalt, als würd mein Herz erfrieren" (Sometimes I'm not myself, I'm so cold, as if my heart would freeze to death). This powerful imagery conveys a deep sense of emotional numbness and detachment, making it a memorable and impactful word.
Have you ever found it impossible to say "I'm sorry," even when you know you should? Samra's "Es Tut Mir Leid" [I'm Sorry] is all about that struggle. He sings about being able to say "Ich liebe dich" [I love you] and "Bitte bleib'" [Please stay], and even writing a song in seconds, but those four simple words, "Es tut mir leid," just won't come out.
He really lays bare his inner conflict, describing how he can be cold and unfair, even to the person he searched so long for. He admits to yelling and hurting his loved one, creating "Risse in dein Herz" [cracks in your heart], but underneath it all, he's just scared of losing them. It's a powerful look at how pride and fear can get in the way of expressing true remorse, even when love is clearly there.