If you are requesting a divorce through the sole fault of the other spouse, it is very important to prove before the court that behavior and actions of that spouse led to the marriage breakdown. The evidence should be strong and unambiguous. As an evidence you can use i.a. testimony of the spouses, testimony of the witnesses (e.g. family members, friends, employees, strangers, lover of the other spouse), private detective's report and testimony, photos, videos, invoices, bills, history of the bank account, history of the other spouse phone calls.