I wish I could say he was playing his "friends" against me but I've snooped and read his e-mail so I know they really are pressuring them. They are also not really his friends. He works with them and he never spent any time with them before he started drinking every night after work.
I should also point out that those in the group he is going out with had all just broken up with their girlfriends/boyfriends before we started having troubles so they do not want to see him back with me and happily married. And, these are all people I have never socialized with. He is not spending time with any of his friends who actually like me or have spent any amount of time with me.