Witr and Nawaafil

Doing Istikharah to find out the truth

Q: Can I do istikharah for knowing the truth or is there any dua for revealing the truth?

Recently, I have been stuck into some confusions and doubts about my partner. But I really don't know if he is telling the truth or not. I saw many hints that's why I just cannot put trust on him. It's killing me inside. I cannot concentrate in my daily work. I don't know if it's true or shaytan is making me think things? So I badly want to know the truth so that I can stable my mind and move on. Is there any solution or any dua?