I'm a 48 year old male and have had many experiences with females and one thing that I feel very comfortable in sharing is that you never ever trust a spouse fully. As a single man I have been/ slept with others cheating wives and girl friends.  I've never had a woman cheat on me and that's because I make it my business to know what is going on in their lives, on their phones and Facebook etc. I do not eccept privacy. If you are with me then you are an open book and I to you..nothing to hide otherwise move on. What I've learned may be hard to believe but I'll make it as brief as I can. Women for the most part are very dedicated and loyal to their spouses or boyfriends until they get bored and their attention is focused elsewhere. This usually happens when they are at the most weak time of their lives. This happens early on, in their teens, between the age of 27 and 37 and lastly between 43 to 50. Their sexual libido is on fire and this is when you should be on high alert. They will start flirting with male coworkers and possibly much more..meet people online and carry on an affair that may become physical very quickly. The sexual urge to be intimate with other men is so strong that they cannot fight it and ultimately succumb. Because normally they aren't comfortable cheating they need an excuse to justify their deed and so they act different around the house picking some type of fight or argument with their spouses to eventually have the excuse to say, " you don't treat me right" or " you don't love me anymore" or " you don't have sex with me as you used to so I have to get it elsewhere " etc. This way they can cheat with  peace of mind and justification...it's more pleasure able.  So the key is to keep a close eye and periodically look at their phones and ask to see their facebook etc. The quicker you catch the start of something the better the chance of killing the progression of a potential disaster. GOOD LUCK.