I'm about to commit infidelity.
Oh my, why? Will that not hurt your wife?
I know it's bullsh*t but I can't stand my wife anymore.
Committing infidelity while you are married is very wrong since it will cause your partner to be emotionally hurt and lose trust in you. If your wife's behavior has been annoying you, you should work to resolve the issues that have come up rather than go and step out on your marriage with another woman. Working with a marital counselor would be a good idea so that you can work out whatever is causing a rift between you and your wife.
She has hurt me big time and doing things like she grabs my credit card for shopping but doesn't want to buy food for the kids.
It seems like you're having issues with your wife but infidelity will not solve that, it will just make it worse. If you no longer love her, then there are ways to get a divorce and you will not be cheating on her if you properly have divorce.