You need to cut all contact.
Yea it hurts and it sucks like crazy..but you will only prolong the agony by keeping in touch w/his mother for the play by play.
??
Why do this to yourself?
And as far as his new woman --he's AN ADDICT. He's on brain and emotional altering substances. Who knows what he's thinking or feeling. Most likely - he's NUMBING it all out.
I'm sorry you're in pain, I also was shut out in a similar scenario and it hurt like hell... but I found it much easier to leave and cut ALL ties.