It is typically used as a way of ending off a letter. It means that the writer of letter is being true to the receiver of the letter and the contents of the letter are factual.
Love is an intense feeling of deep affection for something or someone. The causes and effects of this emotion are subjective, and vary from culture to culture.
In the sentence; "What the hell are you doing?" 'the hell' is called an interjection; an article of speech that is not critical to the sense or structure of the sentence. Compare;
"What on earth are...
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