Edit: grammar

So.  

A buddy of mine has been dating the same girl for about the past two years or so and since then she has boned several guys in our circle of 'friends.'   One guy in the group in particular is/has been banging her and has openly brought it up when the couple isn't around.  Everyone else knows except for the guy.  It's a pretty shitty situation.  Thought he deserved to know, so I finally confronted him about it alone.  After the initial confrontation about it, a few other friends chimed in and let him know the truth too.  Shortly after, he confronted his girlfriend about it and she completely denied it calling all of us who told him liars.  
He believes her over us.  It's a damn shame.  

The guy that's fucking her in the group and her boyfriend have never been fond of eachother, so that guy isn't willing to own up to it and is instead helping her with this lie.  They have since then deleted all previous sexual texts and started a new chain sending fake messages as a front like "I can't believe they're all saying we're hooking up," as if that were enough consolation.  

I figure it's not really worth that much more to time and effort if he's not going to believe us.  Seems like some pretty serious denial, especially considering the fact that the boyfriend did notice that his girl and this guy she's fucking have been flirty in the past.  He asked for proof, but unfortunately there's really nothing on the plate as the very descriptive sexual texts fucker guy showed off have since been deleted.  
Figured I might as well ask you guys to see if there's any hope for this poor bastard.  One of the friends who confronted him also mentioned that he saw her giving the guy a handjob.
user
Friend's girlfriend is cheating on him, believes
assistant
Edit: grammar

So.  

A buddy of mine has been dating the same girl for about the past two years or so and since then she has boned several guys in our circle of 'friends.'   One guy in the group in particular is/has been banging her and has openly brought it up when the couple isn't around.  Everyone else knows except for the guy.  It's a pretty shitty situation.  Thought he deserved to know, so I finally confronted him about it alone.  After the initial confrontation about it, a few other friends chimed in and let him know the truth too.  Shortly after, he confronted his girlfriend about it and she completely denied it calling all of us who told him liars.  
He believes her over us.  It's a damn shame.  

The guy that's fucking her in the group and her boyfriend have never been fond of eachother, so that guy isn't willing to own up to it and is instead helping her with this lie.  They have since then deleted all previous sexual texts and started a new chain sending fake messages as a front like "I can't believe they're all saying we're hooking up," as if that were enough consolation.  

I figure it's not really worth that much more to time and effort if he's not going to believe us.  Seems like some pretty serious denial, especially considering the fact that the boyfriend did notice that his girl and this guy she's fucking have been flirty in the past.  He asked for proof, but unfortunately there's really nothing on the plate as the very descriptive sexual texts fucker guy showed off have since been deleted.  
Figured I might as well ask you guys to see if there's any hope for this poor bastard.  One of the friends who confronted him also mentioned that he saw her giving the guy a handjob.
user
Friend's girlfriend is cheating on him, confronted
assistant