How do I expose the affair

[mb28]

Need advice,

I have kept my emotions under control since last nights discovery of the A. H and OW still have no idea that I know. I’m still devastated; however I do feel a sense of calm now that I have no doubts. I felt like I was going crazy with wondering if H was having an affair or not.

After H went home he texted me “Are you home”, I didn’t reply. Then he tried to call me, again I didn’t answer. Then he called our daughter and asked where I was. Of course I told my daughter I was going to a make-up party.

I’m not sure how to expose my findings with H. I will see him tonight, and have been thinking about how to bring it up. I know I can’t control the whole conversation, but I do have some ideas of what I want to say. I plan on saying something like this. “So what did you do last night?” He’ll lie of course, my response will be, “You didn’t go work-out at the recreation center”, this is where I seen them in the parking lot. Not sure what his response will be, but I plan on saying “It looked like you were getting a good work-out in your truck with her”. Then sometime during this conversation I plan on telling him to tell the OW she has 48 hours to confess to her husband or I’m telling him.

I desperately need advice on if what I want to say is ok. Please anyone 2x4’s or anything else.
my sitch