That is because they preferred the worldly life over the Hereafter and that Allah does not guide the disbelieving people.
The Saheeh International Quran Translation
ذَٰلِكَ بِأَنَّهُمُ ٱسْتَحَبُّوا۟ ٱلْحَيَوٰةَ ٱلدُّنْيَا عَلَى ٱلْءَاخِرَةِ وَأَنَّ ٱللَّهَ لَا يَهْدِى ٱلْقَوْمَ ٱلْكَٰفِرِينَThat is because they preferred the worldly life over the Hereafter and that Allah does not guide the disbelieving people.