I know how you feel. I am a single dad of 5 children between the ages of 3 and 12. My wife walked out last October after 15 years of marriage, she was away for a month and had several affairs, before returning to the UK and telling me and the children we were splitting up, because she had met someone else. She has since started a new life in Italy and shares her time between Italy and the UK. I have had all five children every day and night since October and do the school run, drs, dentist, dress, etc whilst my ex wife complains that she can’t cope with the children anymore, hence the reason for her leaving.
She comes and sees the children but will not spend a reasonable amount of time with them as she can’t cope with them. I feel like each time she goes away, the children are upset and then when she has gone they settle down and then once she returns the whole cycle starts again. Each time if feel like I’m moving on, she comes back and all the old feelings come back again. I wish I could just have a clean break from her.