<human>: Can you condense the text into a few key points?

Well, I don't have very many details yet because she just sent me a message about this a half hour ago.  

My best friend [24F] is engaged and the wedding is not that far off.  But she just sent me a message today that she found iMessages on his computer of him talking to another girl (calling her sexy and hot--she sent a brief screenshot).  Apparently he confessed to texting girls asking for nude pictures.  She said she thinks the wedding is off.  

Apparently he also said that he's a sex addict and that he needs help.  

Needless to say, she's in shock as she just found out this morning.  She said that she's going to go stay with a friend for a little while.  

I honestly don't know if I believe that he's a sex addict.  I don't know if she should believe him or if it was the best excuse he could muster up for getting caught.  They've had issues in the past of differing sex drives (she wanted sex more often than he did).  I guess that's not really a reason to believe or not believe him? I don't know. 

I did once receive a weird picture text of him without a shirt on that I ignored and just assumed got sent by accident.   Now, I'm kind of wondering what that was about.  I probably shouldn't bring that up with her though.  Ugh, I just feel so awful about this whole situation.  

What can I do/say to help her get through this?  Has anyone been in a similar situation? Dealt with a sex addict?
<bot>: Best Friend [24F]'s fiance [26M] has been texting girls for nude pictures, got caught, claims he's a sex addict and needs help.