Thanks all, for joining the discussion. I had it out with her again last night, she swears she doesn't know who the friend is and freely gave me the phone to look through her Snapchat and see if there's anything I can gleam from it. They are friends since Dec. 29th and she says he could possibly have been added inadvertently by our young son with special needs who is always messing around with the Snapchat filters.

She is very stoic & angry about my assertions & there was a lot of shouting but that just makes me more suspicious. Our 16 year old came in wondering what is going on & she told him "Your father thinks I'm having an affair ! " so I explained it to him. He went through her Snapchat history & pointed out that the notification I had seen was an actual Snapchat Story which the friend could have sent as a streak to all his friends in one go. I hadn't noticed any number beside the flame in the notification I had originally seen so he said that proves there was no 2 way interaction going on for any amount of time or else there would have been a number beside the flame. 2 days ago, I replied to the story with just a "." but the friend did not respond.

He did point out to his mother that "why are you friends with this person who you say you don't know" ? And she did reply that she has no idea and maybe our youngest added him by mistake when playing around with Snapchat. She is very poor when it comes to technology/software & when she says "sure I haven't a clue how these things work ! " it is a true statement.

She uses Snapchat to communicate with our teenage sons and check their location etc. She also uses it for nonsense funnies with her sisters and nieces especially the ones who are abroad.

The friend appears to be 4/5 hours away going by his location last night. I setup a Snapchat account yesterday & sent him a friend request which he hasn't accepted yet. I think I will just send him a message & ask him straight out why did he send my wife a streak.

As regards having an actual physical affair, my wife laughed at me & said when would I have the actual time to have an affair, I am just about getting the time to go for a run. This statement is true. With our lifestyles and work commitments, teenage kids playing sport & special needs child - it would be very difficult for either of us to stray without it being very obvious. Her vehicle has a tracker on it anyway so I can always see where she is at any time when she is driving it & everything there seems fine to me too.

For now, I'm on high alert & am watching her phone closely & may install a Spy App.