Quite a few years ago my now estranged husband was cheating on me and I drove myself almost insane in the pursuit of evidence collection.
Trackers in the car, screen shot and key stroke software hidden body cams I even had his car clamped just to see who he would call to get cash to unclamp it. no matter what I did he still denied it.
In the end I had emails to and from several women, audio recordings of him with them, shit loads of profiles with pictures on meet up for no strings sex web sites and actual photographs of him having sex with about 20 other women. Even when confronted with all of this he still lied and said he wasn't up to anything.
I started doing this after one of them phoned me with a load of gory over share details before that call I had no idea.
My need for evidence was to protect me from having to make him rich due to the prenup we had, ok so it achieved that but the flip side of it was I turned into a person I did not want to be and every single bit of evidence I obtained killed me inside just a little bit more and every single confrontation and lie piled on the stress and anger.
I have no respect for myself regarding my conduct during that time in my life.
The entire period of time I was snooping actually made me feel worse than if I had have just yelled at him a bit then told him to fuck the fuck off.
Granted he was cheating and that was totally his responsibility but I am responsible for the bitterness and hostility and dragging the whole thing out that me snooping caused.
If I had to decide again what to do and didn't need actual evidence for financial reasons I would not do it again, not even a sneaky text message check,it's damaging low behaviour.
No matter how someone else behaves you don't need to lower yourself to wrong doing as well. Usually after that length of time of knowing someone unless you have a history of suspecting that sort of thing if that's what you think your more likely than not correct. You just have to decide how you move forward.
Do you really need irrefutable evidence and if so how long are you prepared to look for it for? Will one day of checking be enough or will one week? One month? One year? How much can you take of feeling that way? Where will you draw the line one day it's phone location checking next it's chucking 30k at private detectives.
Do you even want to turn into that person no matter how long or short lived it is?