Spouses should always be willing to share their online and cellphone passwords particularly if one partner starts to feel insecure about perceived or actual flirting or emotional affairs.
I think people should conduct themselves in any such communication with the opposite sex, like their partner is online, viewing and responding emotionally to text or listening in on the call. This goes for online porn as well.
The relationship and couples counseling science is conclusive here. The popular idea that someone is over emotional or crazy when they feel insecure emotionally is false. This response is normal. It should signal their partner to provide reassurance and soothing before things get out of hand.
The idea that opposite sex friendships that lead to extra marital affairs, are some how the exception, is also false. It's actually the other way around.
In the current economic and social climate, we have to try and keep marriages and families strong.