WH has had contact with OW, need advice

I've discovered from monitoring text messages (unknown by WH) gps tracking and VAR that he has had contact with the OW. I am 99% sure because of my surveillance that it was not sexual. His former boss/"best buddy"/"brother" has always had him get things at a big discount from her work for him. I knew this before I knew about the affair and thought she was only a friend. The "best buddy" has tried to break us up in the past, his wife is best friends with WH's ex from a couple years before we met and he would like to see them back together. I intercepted a text from "best buddy" asking WH to get the discount for him. They then had a phone conversation I didn't hear, I'm assuming about this. Next day I had VAR in the truck and knew his plans for the day. Luckily when he left a neighbor was talking to him and asked the time and I watched his travels on gps so I know he met someone at a coffee shop before his first scheduled stop. I can't hear their voice, only a few things he says. Nothing incriminating, just can tell he met with someone and they were there for about 15 minutes. I can hear his music and him coughing the whole time, but not much is said that I can hear above the music anyway. I can tell for sure he wasn't talking to himself. After he left there and did his first errand he meets with someone again and I think it was "best buddy" to deliver. He tells me everything he does (or is supposed to) so I won't worry but he left out those two meetings. I caught him meeting with her two months ago for 15 minutes also. I had a feeling something was up and followed him when he went to do his laundry. He swore he was there to confront her because I had told him I heard rumors he was talking to her. It wasn't rumors but texts I thought were from or about her and I wanted to confront him without letting him know how I knew. He said I could ask her, so he took me to her and I did. I had not seen her since before I found out. She had a major attitude like I was the one in the wrong for being angry about the A. Seriously. She wouldn't confirm or deny why he was there. I was not thinking rationally enough to ask the right questions and basically went off about the past more than anything. Then I left and packed my stuff. WH was so convincing, and I'm not emotionally ready to be gone so I came back after a week. He had been doing everything else right up until that point. I figured he was probably running errands for "Bes t Buddy" and have been emotionally preparing myself to ask him for a polygraph, because everything really depends on that. I just need to be ready to do what I need to do in the case that he refuses or fails. My question right now is, what do I do about knowing he is meeting her for his friend? If I confront him I'll blow my cover and won't be able to find out if more is going on. If I use the rumor story again he'll demand to know who the friend telling me is and want to confront them. I'm thinking of contacting her and telling her that I know they met Thursday morning and asking her again to stay away. I know she won't care, but if she contacts WH to tell him I know, maybe that will help in some way?? Or maybe she will stop helping his friend out because she doesn't want me bugging her? I don't know. It is not okay with me for them to have any contact but I know his "best buddy" has always been there for him and WH would never want to let him down. He would think as long as he's not doing anything else its okay.

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