Wendy, Do you have a bug issue right now? If not, I think you are very wise in considering having the house "tented" when it is completely empty. This is a huge undertaking and yes, you have to bag all food items up and the pets will need to relocated during that period. Notice how he wants it done while he's away? He wants you, mom, to take care of everything. I wouldn't even think about doing this w/o him there.
Wendy, long before they start hooking up w/op, they have already detached from us and that's why you think he doesn't care about you. They are way ahead of us in detaching, but they are also way behind us at the end of the day. Why? Because they are self-medicating and we are the ones that are facing the pain each and every day, but we are also learning life's lessons as we go along.
You need to set your boundaries because right now, he doesn't respect you as his wife, companion, mother or lover. I'm sorry that he's acting like a true blue butt, but twinkle has sprinkled fairy dust into his eyes and he can't see anything but the illusive happiness he thinks that the will have w/her.
Now is the time to start taking care of Wendy and doing what Wendy needs to do in order to survive this mess.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.