Looks like you are less than 10 years into the marriage. Get out ASAP. You are stuck with alimony for basically half the length of your marriage. Unless it exceeds 10 years. Then you are stuck for life.
Wow, those are some crazy laws. Child support is mandatory around here, and follows well defined rules, but spousal support ("alimony") is much less well defined and (in my limited understanding) less common and shorter lived.
Edit: "around here" being Australia and New Zealand