My WH and I have been married for ten years. He and I were classmates from university and we have been together for 15 years total. We have two adorable daughters of 10 and 5.

He had been having an affair with a girl from the place he often goes to business trip about a year ago. I've found 100 of their secret e-mails last December and I had tried to rebuild our relationship doing Plan A, but we had a big fight over their photos together and he left our house.
We had been separated for almost 4 months now.

He pays the house loan, child expense, but for the rest, I have to work and earn for our living.
My health condition is not good after the birth of my second child, but kept working because our financial situation was rather hard. And after the separation, it gets even worse because of the enourmous stress and I get pills from the phychiatrist. WH and OW are still seeing each other, exchanging e-mails, almost every night phone calls (I can tell because the telephone bill
comes to our house first) Once I wrote her an e-mail telling her that I have no intention to divorce him, and think about the enourmous pain she caused to our children. (My elder daughter couldn't go to school for almost two weeks having fever and couldn't eat )Surprisingly she replied, and said she was sorry, but finished with the word how much he loves her and the life is tough for everyone(!) I think she is rather stupid saying such a out of point conversation( or maybe she is tough customer)

He told me that he has no intention to come back any more, but do not hast for divorce, because it is no good for children to have no father.(It is almost like it now.) He comes over twice a month to see our children, sometimes we eat dinner together, and when I was sick he comes over and take care of the kids and do housechoirs.
And he asked me to come along to the camp he is planning to go with the kids. I told him I am not going twice, but when he asked me the third time, I said I would go. But going with him gives me pain, he never tries to touch me, doesn't even talk much.

I don't know what he is thinking. He cannot get married with the OW maybe because he is a client for her advertising company, and if everything exposes, both of them lose their job. For OW, I don't care what she is going to do, but for him, it strikes our financial situation if he loses his job.

What shall I do? Shall I try Plan A and wait more? Could somebody give me advice, please?
(Sorry for my messy sentences, I am a little upset now.)