affair

My husband had recently come into a lot of mental health issues. severe depression and anxiety he tried to commit suicide recently.
After therapy on Saturday he came home to tell me he had an affair and I needed to save him. Shortly after his ex gf messages me to inform me that shes "sorry" and if I have any questions she will answer them. I ask her how long. she said 7 months. I asked if they had a plan and they planned to wait 10 years until our and her children are older to be together. she said she ended it last week because the stress was too much. she asked if I wanted the emails. I said yes.. it outlined in great DETAIL of the whole relationship I assume it was partly vengeful on her behalf to send all the screenshots and emails. She broke up with him and moved away to another country. I picked up the pieces after she left and we started dating, got married and now have 2 young kids 1.5 and 5 years old.
he told her in an email that he never got over her that hes been creeping her for years that all hes done is creep her on facebook to look at her photos and think about her. for so long that he shouldn't have "this" life that he shouldn't have children that its been that long. (ouch!) that evening she told me her and him have been having an "emotional affair" for years. that its ALWAYS been her she then sent emails from 2010 of him saying he wish he could go back in time and be with her to follow her moves stay with her (when we first married) . she ended it with him and they have no further contact I had him change his phone number and delete his email account. she was vengeful and mean she told me its always been her and to enjoy reading how obsessed my husband has always been with her how he regret his life with me and how hes in it for the kids. He said he loves me and needs me that he gave her up. shes mean and he needs to get better wants to watch our kids grow up, mentally hes in such a bad place. how do I move forward? how do I forget the details.