Just because you have proof does not mean that you will confront them with what you have discovered. That decision is yours and yours only. It is a possibility that you will get lots of advice from your friends on what to do. Just remember to always consider the source when someone gives you information, this is very important. Everyone has a motive and the person that is giving you the information (whether it is good or bad) may just have an ulterior motive. Just keep in mind to always consider the source of the information you are getting. Just remember to get your facts straight when confronting your partner and keep it brief. Do not be accusatory or jump to conclusions. If the relationship is important to you and it is worth saving, think long and hard before you do anything rash. If you see something that looks suspicisous on your mates phone, see a strange name or number on his desk, check it out. There are many places on the internet you can do a people or reverse lookup search. Sure it will cost money, but how much is your sanity or relationship worth?
You shoould never expect your partner to confess to you what is going on. Very rarely will you ever here that they have been having an online affair. Do you really expect them to? When they realize that you know, chances are real good that they will try to reverse it on you and say something to the effect "You are sneaky yourself" or any other such variation. Anything to attempt to take away the attention from themselves.
Is your partner sneaky? Do they keep you in the dark about a lot of things, such as their relationships, phone numbers and who they talk to? It is cliche, but if you smell a rat, there is a rat somewhere. The same holds true if you suspect that your partner is having an online affair. If you suspect it, then chances are real good that they are having on. You need to be prepared for what you find out, it may not be what you want to hear, chances are it will not be. If you suspect that your spouse is cheating, there is a good chance that they are, do your homework and remember not to get hostile with your partner.
Hostility always leads to trouble and it is not a good way to let your partner know what is going on. Knowledge is power and it is up to you to decide what you want to do with it. Do you want to end the relationship because of what has happened or do you really love the person and it is something that is forgivable. It may depend if there was physcial contact or if it was restricted to cyberland only.
You can count that they will deny what you are suspecting at first. Noone wants to get caught, and they will point the finger back at you and blame you for everything, this is to be suspected so do not be diappointed. Very rarely are they going to own up to what they have done wrong and make it right, it is up to you to find out what their intentions are. You still need to keep your calm at this point and your cool, it just makes things physically and mentally worse for you and your situation.
If you want closure and want to finally see what your spouse is up to, whether they are cheating or not, then you need to get to the bottom of what is going on. A paid reverse phone number search will do the trick. There are countless ones on the internet, do a search on your favorite search engine to find the best options.