How do I expose the affair

[mb28]

Update:

Tues - H comes by so we can take him off my cell phone plan. I was having a very bad day and feeling very emotional. I knew it was a bad idea to see him, and I was very weak. While we were doing the phone stuff, I started pursing, which I haven't done in over a month!

Me: Do you want to have dinner together in a week or two?
H: Maybe, I don't know, we'll see (acting annoyed)
Me: What about having dinner this Sunday with us and the kids? (As if one rejection wasn't enough)
H: What? I don't know (acting more annoyed with me)
Me: What do you have to do to get out of your lease?
H: Pay 3 months worth
Me: If you change your mind about coming home, please don't let that be a factor in stopping you. We can figure out a way to get out of your lease. (Again as if 2 rejections weren't enough, I guess I wanted more (-:)
H: I don't think I'm every coming home, so it doesn't matter.
Me: I thought you said you were having 2nd thoughts?
H: I was, but I just don't ever see it working between us.

He left and I just broke down crying the rest of the night. I don't know who I was madder at; him for rejecting me or me for putting myself out there like that.

Wed (the next day)
I get a text from H: Sorry I was so grumpy last night. I'm having a hard time adjusting.
I didn't respond and then a couple of hours later he showed up at the house to get something for the kids (his night), and I was already home from work.

H: Your nails look pretty
Me: Thanks (thinking he has lost his freaking mind)
H: I wish my lease wasn't so long.
Me: OH (thinking maybe he is on drugs!!!! J/k)
H: Do you want to go 4-wheeling with me and kids on Sunday?
Me: I don't know I'll have to see, I have a lot of homework (thinking he has an evil twin that was at my house the day before).

My therapist said he is the one on a big rollercoaster ride with huge ups and downs. I need to be the stable straight train that does NOT go up and down hills based on his rollercoaster.