There are two different agendas with meeting him. Yours, you want to see want went on the last 6 weeks and get closure. His.. he has fallen flat on his face and may want you to feel sorry for him, will try the line again of we could just live together as friends for awhile and see how it goes etc.
Perhaps if you do make a time and place to meet with him you make it quite clear when agreeing to the visit that you want to see him but he must not be under the impression you want to live with him again.
I have no sympathy for 'the other woman' but I find it a bit harsh that she is getting all the blame i.e:
She didn't help ruin this mans life, she helped ruin many lives. Yours included and what is happening in her own family situation. Has that all fallen apart too? She has children doesn't she?
Mr Cat is an adult he did what he did off his own bat, to boost his ego, mid life crisis or whatever. Mr Cat was in a relationship, so was she. They are both equally responsible for their actions. Mr Cat ruined his own life.
She didn't help ruin this mans life, she helped ruin many lives.
Mr Cat AND Ms SH ruined many lives. This woman is not solely to blame. Mr Cat was not a single man when he entered a relationship with her. Mr Cat did not care this woman had a partner and kids.