The first thing you need to do is get a L. And then find out from the L if your state even recognizes infidelity as a fault reason for D and if it does recognize it whether it makes any difference in the division of property. And finally, if it does what level of proof is required.
Unfortunately, most states either do not recognize infidelity for fault, or it makes little difference in the division of property, or the burden of proof is so high that few people even attempt to prove it in D court.
So get a L and also research the D laws in your state or province. There is a lot of information on the internet so you can simply google "Divorce Law" with your state/province name.
[This message edited by Dreamboat at 11:29 AM, May 19th (Sunday)]