Write down everything you find that you think might be even slightly incriminating. Don’t think that you will be able to remember everything, you are under enough stress as it is without having to keep all the information in your mind. Keep track of all dates, times, unknown phone numbers and suspicious activities. Does he go to the gym but have a dry towel when he comes home, or a wet towel that doesn’t smell? You will be much more able to track patterns in his behavior if you have all the information written down.
Always pay close attention to everything your husband says or does. You may have noticed a strange behavior one day but you’re not really sure if he has done it before, if you write it all down you will be 100% confident that he has changed some crucial habit, or created a new one.
Set your own boundaries on how far you want to pry into your husbands private life. Some women believe certain boundaries are not to be crossed, but you must do whatever is comfortable for you, and remember that often the end will justify the means.
When you finally track down that tangible, physical evidence, take note of exactly how and where you found it. Ensure that you don’t leave any evidence of your investigation behind, make copies of all important paper work or emails and leave the originals as you found them. You do not want to arouse your husbands suspicions until you are ready to confront him. Keep all you evidence in a safe place preferably out of the house.
When you feel you have accumulated enough evidence and are ready to confront him, plan it properly! Have your questions and accusations ready, if necessary make notes so that you will not lose track. It is very important that you have a watertight case at this stage, do not confront him until you are confident in your investigations. This will be a very emotional time and he will lie to the bitter end. You need to be strong and you need to be prepared.
Remember to always follow your intuition, it will lead you to the truth eventually.