I think my wife is having an emotional affair

Hi
I have a strong feeling my wife is having an emotional affair with her business partner. There are many issues that if I make 1+1 comes 2 but I don't know if this is my head or if this is true.

For sure my wife is clever to hide it but emotions are impossible to hide.

Recently we where together in a mall and she told me she is going to find a book in a book store, she went and after 5mins I also went to the book store to find a book for myself. I saw my wife and I wanted to make her a joke from her back I went behind her without she realised as soon I was approaching she took the phone a dialled this guy (I saw the screen of my wife phone) and started to speak with him. It was a really bad feeling for me its like she had a affair went away sitting in the cafe.

Then she came back to the cafe. She told me she stayed long because her sister called her. I secretly checked her call logs and the log did not showed the call log of this guy, so it is obvious she deleted it. She had a log of a call to her sister but it was Outgoing and 0 secs long..

I challenged her and told her she called this guy, when she went to find a book. She admitted it and started to tell me I am crazy bla, bla, bla

I told her I found it on her phone log (which is not true). She told me it was a business call and if she had something to hide she will delete the log. In fact that is what she did she deleted the log.

Why the heck she did so?

The next day she started to tell me I don't love her, I love her for her looks, I need to stop being jealous about this guy, She also look very sad.

I feel really hurt, really betrayed and I just cannot cope with this thing anymore.