Being harassed by a gym instructor

Q: A while before I got married I used to train at a gym. The instructor, a male, had a lot of other males and females in this class. At the time I knew that training in a mixed setting was haraam but I was ignorant and am still trying to repent for this sin. I stopped training after 3 months and then got married 2 years later. Now, after 2 years, the instructor keeps harassing me and making false accusations of me having an affair with him. All this time before I got married I had no contact with the gym or trainer and did not even hear from this trainer. Alhumdulillah, my husband can see that this is nothing but harassment and that I did not commit that sin. I however feel as though I did commit the sin by just being in the presence of men in a mixed gathering and training. He is accusing me of a whole load of false accusations which I did not commit and I have tried to get legal help but the more I fight back the more out of control this situation becomes. I am really afraid that people are going to find out and assume the worst even though I did not have an affair. Please can you advise me accordingly.

Correct tasbeeh after salaah

Q: What is the correct zikr to recite after each salaah

1. 33x SubhanAllah

33x Alhumdulillah

34x Allahu Akbar

Or

33x SubhanAllah

33x Alhumdulillah

33x Allahu Akbar

1x Laailaaha illallahu wahdahu La sharikalahu lahul mulku Walahul humdu wahuwa ala Kulli shayin qadeer.

I am confused as I understand both are mentioned in the hadith. Which is the correct zikr to recite after each salaah.

Making dua for someone in his absence

Q: One of my cousins is on the wrong path and I'm very concerned about him. He talks to many girls, and plays with their hearts, just like today's modern society's bad guys. I would want to know of any wazifa or surah to recite on him for him to be guided on the right path. I do recite verse 8 from Surah Aal Imran over him often and pray for his guidance regularly. I want to know any other surah or dua too.