If he expressed any shame in admitting to you about his addiction & if he has been making gestures to try to repair your relationship, I would take his word for it. That all he did was chat & it went nowhere beyond that.
A lot of people with other addictive or compulsive behaviours have others, as well. Most alcoholics also smoke cigarettes, etc. And it's been well-documented that some drug addicts will find a new addiction once they kick the habit in order to "fill the void".
He went trolling on facebook for girls to talk to, not a dating site. He didn't go out of his way [IE create a profile on a dating website] in order to do the behaviour, so it was most likely spur-of-the-moment. Which is not consistent with someone who intends to cheat on you.
However, I suggest that you do as much reading on sex addiction as you can. Both from a victim's & from a recovery perspective -- I suggest he do a lot of reading too. If your relationship is incredibly important to the both of you, there's a lot of work involved in rebuilding trust after something like that. Although there is no replacement for professional therapy, self-help books are a very good place to start the process for the both of you.
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