How much does the law require? You've been married for 4 years, you are both in your 20's and she is only 24 and she "supported" you in your career by being a "stay at home mom" who cheated on her husband several times?
You can get paid for that?!
That's impressive! Considering your short marriage and your young age, I doubt the support could be that extensive and probably only for a very limited amount of time. Does she expect you to support her for the rest of her life?