Tormentas comes from the verb atormentar, meaning 'to torment' or 'to bother'. In this context, it's used reflexively as te tormentas, meaning 'you torment yourself'.
The singer is trying to reassure his partner, asking her why she would torment herself with doubts about his fidelity. It's a strong word that highlights the emotional distress she's experiencing and his desire to alleviate it.
In "Hola Mi Amor," El Chapo de Sinaloa sings about coming home after a long, tiring day and finding comfort in his partner's presence. He's exhausted, saying "Vengo cansado hoy fue un día muy fuerte, bastante pesado" [I come home tired, today was a very strong, quite heavy day]. But he feels complete and happy just by being with her: "no me siento completo y feliz porque estás a mi lado" [I don't feel complete and happy because you are by my side].
He notices his love is sad and immediately wants to cheer her up. He can't stand to see her with a "carita triste" [sad little face] and reassures her that he would never betray or leave her, even joking, "ni de chiste" [not even as a joke]. He tells her she's the most important thing to him, saying "Si tú sabes que eres lo más importante y te amo de más" [You know that you are the most important and I love you too much]. He promises to always love and care for her, making it clear his affection is genuine and forever.