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.

Hey, I just imagined all of this happening to me at 25 and I could feel how tough it would have been to believe all this. But now that I am 38, and I put myself in the same situation and I think I though I may have same disbelief but I will behave differently. Like, when I will speak to my father I will not talk with disgust. Anyway, I think you must confirm first what is happening in his life. Though, a man of a father's age has no one else to text apart from his wife or daughter, and if none of you are at the receiving end then there must be something fishy. I think you find it out to the core and if he is really seeing someone, confront him like a mature person. At this age, if he is straying out of marriage, find out the reason. Only after listening to him, you can decide how valid his point is. See, it can be just an emotional support he is seeking in someone, because with age sometimes women take husband wife relationship to some platonic level. They are least physically intimate and emotionally too they keep their relationship below every other relationship. They give priority to children and what is going in their life and contended with the mundane functioning. Men, on the contrary want a partner's emotional involvement in one's life. And if everything is at the back burner, he may get swayed if someone shows just little warmth. May be it is the case of emotional paucity. Do not reach to conclusions and talk to I'm first, and the you can decide how and when to bring your mother in or not.