How do I expose the affair

[mb28]

Allen A,
He does NOT tell me where he is going, and I told him that yesterday how I didn't like that I was always telling him where I was at, but he would get mad when I asked him where he was going.

I do have a feeling these texts are being kept from OW. They happen mostly during the day while we are at work. I know they are a half-hearted effort on his part to work on the M. At first I liked the idea because he was finally initiating something. However, I feel like I need more now.