What am I supposed to do? I think my dad cheated on my mum. He accidentally text me some message saying "Dear I reach home ready, text me when you reach there. I love u dear" but my mum is home with him. omg.... I feel so lousy.

How close are u with ur dad and with ur mom? If I were u I'll confront my dad; face to face or through text. If he admit, advise him t stop his nonsense. If he denied, warn him better not let me catch him doing unfaithful stuff. then observe n depends on his attitude, if he continue his nonsense, tell ur mom. If I were u, I don't mind them getting a divorce and make sure the dad gives alimony to the mom. Because, do u really Wan t cover up for ur dad? Or do u really Wan t live in lies? I hope you n all ur siblings are already financially stable.