Think for a moment. They have had months and months of phone calls and contact. This is not the matter of a few contacts. You have texts and calls late at night, while this guy is supposed to be in bed with his wife. The investigators are going to look at this and ask themselves. "How many wives are going to be OK with their husbands talking and texting to another woman all evening. Gurka can also testify to the fact that the OMs wife gave him the phone number of his WW secret phone. The investigators will ask her if they can see the phone records for it. Gurka there is a mountain of evidence of an improper relationship if no adultery. The more info to sift through the more chances of them slipping up with a lie.