Haram Speech & character
Yes. Allah compares backbiting to eating the flesh of one's dead brother (49:12). The Prophet ﷺ explained that it is mentioning your brother in a way he dislikes.
يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ ٱجْتَنِبُوا۟ كَثِيرًۭا مِّنَ ٱلظَّنِّ إِنَّ بَعْضَ ٱلظَّنِّ إِثْمٌۭ ۖ وَلَا تَجَسَّسُوا۟ وَلَا يَغْتَب بَّعْضُكُم بَعْضًا ۚ أَيُحِبُّ أَحَدُكُمْ أَن يَأْكُلَ لَحْمَ أَخِيهِ مَيْتًۭا فَكَرِهْتُمُوهُ ۚ وَٱتَّقُوا۟ ٱللَّهَ ۚ إِنَّ ٱللَّهَ تَوَّابٌۭ رَّحِيمٌۭ ﴿١٢﴾
信道的人们啊！你们应当远离许多猜疑；有些猜疑，确是罪过。你们不要互相侦探，不要互相背毁，难道你们中有人喜欢吃他的已死的教胞的肉吗？你们是厌恶那种行为的。你们应当敬畏真主，真主确是至赦的，确是至慈的。
Abu Huraira reported Allah's Messenger (ﷺ) as saying:Do you know what is backbiting? They (the Companions) said: Allah and His Messenger know best. Thereupon he (the Holy Prophet) said: Backbiting implies your talking about your brother in a manner which he does not like. It was said to him: What is your opinion about this that if I actually find (that failing) in my brother which I made a mention of? He said: If (that failing) is actually found (in him) what you assert, you in fact backbited him, and if that is not in him it is a slander
حَدَّثَنَا يَحْيَى بْنُ أَيُّوبَ، وَقُتَيْبَةُ، وَابْنُ، حُجْرٍ قَالُوا حَدَّثَنَا إِسْمَاعِيلُ، عَنِ الْعَلاَءِ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " أَتَدْرُونَ مَا الْغِيبَةُ " . قَالُوا اللَّهُ وَرَسُولُهُ أَعْلَمُ . قَالَ " ذِكْرُكَ أَخَاكَ بِمَا يَكْرَهُ " . قِيلَ أَفَرَأَيْتَ إِنْ كَانَ فِي أَخِي مَا أَقُولُ قَالَ " إِنْ كَانَ فِيهِ مَا تَقُولُ فَقَدِ اغْتَبْتَهُ وَإِنْ لَمْ يَكُنْ فِيهِ فَقَدْ بَهَتَّهُ " .
This is general information, not a fatwa. For your own situation, ask a qualified scholar.
Yes. Allah compares backbiting to eating the flesh of one's dead brother (49:12). The Prophet ﷺ explained that it is mentioning your brother in a way he dislikes.
