read boooks it will help you

Go to library, find books. If he already filed divorce, you can call police. I don't think the court will give you more money if you find the evidence of "the other woman". US is different.Well, at least the stories I heard and the experinces I went through for my own case were different. You may get the sympathy but not the money. Ask the lawyer first (normally the first hour is free). Do not think he will take care of you after the divorce. I heard so many stories about that.

Good Luck.