Time was that a woman (I say woman merely because they are more likely to bother to investigate not less likely to stray) with suspicions would have to resort to some kind of under cover, eyeholes in the newspaper mission to know whether or not they were no longer the one and only. If the object of your affection is taking three buses, doubling back and changing trains while they are moving on the way to work...it's probably not a good sign. It's the stuff that old movies are made of and that makes any sane woman laugh now - what an awful lot of effort to have to go through.
So, "The Scorned" moved on. Check receipts, check credit card bills, check the phone bill...check every bit of a paper you can find and you'll get to the truth. The paper trail was the key. Not so much the old movies but defintely the odd story line in almost forgotten episodes of EastEnders or Corrie. Either way, if your other half was binning his litter out on the street, you'd be worried.
Then came the mobile phone. Get hold of it, check the sent items and the inbox and the last calls made... They might not think of it all and it would be evidence enough to either put your mind at rest or call the lawyer. I remember once being warned by a particularly faithless man "if your other half ever starts to take his phone into the shower, toilet or bath...you're f*cked". Nice to know.
Then the personal email accounts came under fire. Scary stories of people hacking into email accounts of other halves to see what was going on. Not one of these stories ended well I'll point out. I suspect if you're looking there, it's pretty definite already. This happened to male and female friends of mine and although the one that makes my blood run coldest is the one that seems to happen most often.
And now Facebook has touched this long running story of deception... It's the worst thing in the world for a cheat. Facebook - the devil in technology. You can't keep your profile secret from you other half to hide what you're up to (how suspicious is that?!) and even worse...you have no control over what other people write on your wall. Disaster is sure to ensue. Images of "great night last night, big boy" on the wall of some lothario - funny for us, not so the lothario. So, you have to get out all together if you want to get up to know good. Remove yourself from Facebook under some pretention that you don't want to be on there anymore. Problem is - what pretension? There isn't one I can think of, seriously, i've tried but isn't it just so much easier to stop going to the site than to close it down? It's suspicious and that's that.
So maybe next time a friend of yours tells you their worried, maybe the first thing you should do is check Facebook...