I can't believe he was saying this...

The night before we had gotten into a fight over something stupid. This morning I still wasn't talking to him.  He was talking to a female friend through messenger on fb. Her response to this was that it takes a whole year to get out of the honey moon stage then you really know a person. 
And that she hopes we remain friends after. 
Considering we had been in a quarrel the night before, what would you do? I saw this and was instantly hurt so I don't want to make any irrational decisions. 
And please spare me on the "looking on his Facebook/ privacy" thing.
If I feel something is wrong, I will look.