Who can advice rightly ?

Sorry its kind of irrelevant post but really need to ask، Can someone give me an advice? :

Lately, I noticed that my husband had lots of calls on His phone, and when I ask who is it, he always hangs it up quickly and he says it's one of his friends/business contacts.

I also noticed that recently, he has been coming home late, and when I ask why was he late, he always tells me that he went overtime because of a team meeting, although when I checked his pay slips, he had no overtime fee and I was a bit surprised since as far as I know, they didn't had any team meets since 3 months ago.

So, I went to his boss and asked about this, but his boss said that they only did a team building meeting one time with his co-office mates a long time ago (which confirms that I was right), and as an extra, he has been absent on that meeting, and his boss told me that he's been absent from work a couple of days as well.

The next day, he went out and told me he'll be attending his "urgent team meeting", so, keeping a distance, I followed him with my friend in her car and not far away from our place, a young girl fetched him from his car. 

We stopped our car from a distance to make sure they won't hear me and observed them, and when they were going to drive out, I was about to follow then but when We started the engine, it died on us.

So I want to ask for advice, where would the problem be?

, ,
,
 ,
,
,
,
,

Is it the spark plug that caused the starting to fail, or is it on the main engine? The clutch, perhaps? 

Please give me a good advice.