I think my dad is having an affair with a co-worker?

i mean if your anything like me you wouldnt be ableto talk to your dad about it but my advice is to try to talk to him say thigs have been alittle weird and i need to know if you habe somethinf to hide bc its bothering me and if he does then say if you dot tell mom i will and give him a time limit try to act like you know somethings up say you read the texts and they were a lil intimate play it hard and see what you can get :)