How do I expose the affair

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H is moving out of the house today and I’m moving back in tonight.

I was at the house last night with the kids, and he stopped by to take some stuff to his new apartment. And had the nerve to ask if I wanted to go see it!!! I said no and that I didn’t think it was a good idea. He then went on to tell me about all these good deals he found at a store for household items. He was acting like a kid with a brand new toy. He seemed so happy to be finally moving out. This was so frustrating to me to see him like this when on Tuesday he was telling me how hard it was for him to be moving out. I tried my hardest to act indifferent to it all. But I know he could tell it was bothering me, so he did try to act less happy I think.

When he came back later to the house I tried to leave as soon as I could. However, he started to ask me some questions about what I knew about some if his family drama with some of his siblings. I told him what I knew, and then tried to leave. He then started asking me if I was sure I could afford the house, which I replied with a yes. Then he asked if I really thought that I can handle it, again I said yes. And he said to please tell him if I couldn’t. Then he went on to tell me to call him if I needed any help around the house like sprinklers, hot-tub, etc. I told him I would figure those out or ask someone who could help me. He kept saying “I will help you, just let me know”.

His mood defiantly affected mine last night. However, after last night we will only be seeing each other every other Sunday. That scares me that he will be so happy not to see me, out of sight out of mind.