I'm thinking of letting my wife taking go on vacation
Did something go wrong? Do you not want to go on vacation too?
I will get time to rest after a year.
It is good to work hard and make money but you should also take time off. Also it will hurt your marriage to have your wife go on vacation by herself.
It's not like anyone else is being left behind, I can't ask for much.
You are quite caring in letting your wife have the vacation, but I believe you should take time off too with her. She will be able to enjoy the break a lot more with you around, and you can make a lot of good experiences this way. Being recharged means you'll be able to work a lot better too.