Why do people want to dig up dirt on others? People did that to David and he wanted to know why.
How long, O you sons of men,
Will you turn my glory to shame?
How long will you love worthlessness
And seek falsehood? Selah (Psalms 4:2)
There was no answer, but that passage is in the Bible, it is in the Book of Psalms, because David presented his problem to God, knowing that He would deal with the people who sought to turn David’s glory to shame.
People are going to look for lies about you. You cannot stop them, nor can you respond to everyone. However, more than anything, present the situation to God.