If Mukund loves Madhu then he should trust her and if he can't trust her then he doesn't deserve her. So if his heart breaks because of mistrust I don't care.
Yes when there is love trust should naturally follow, i feel Mukkund will trust her but i think he is gonna be a mama's boy and his excuse is going to be that, also which makes her not worthy of Madhu...But then if he trusts her and supports her, he will be the Hero which cannot be the case here since its already RK who is our Hero