I am upset I have to pay my wife's rent and child support.
How long have you two been married for?
Not long enough to be supporting the whole house.
You should work hard to support your family. If you cannot support your existing family you should wait to have more children.
She's gone in months. I'm not cut out for this marriage thing.
Well it sounds like you've concluded that you are going to divorce her. That is probably for the best.