Lots of background here, I'll try and keep it short but I need some advice!
When I was about 9 my mum had an affair, dad found out she promised it was over. She then started going away to visit friends we'd never heard of for weekends and then sometimes in the week. I knew what was happening and it crushed me and one day I came home and she was gone. We didn't hear from her for a while and then she tried to rebuild relationships with me and my sister slowly. She then invited me round one day, which I found hard enough to go and visit my mum in her very own house without my dad (who is my world / best friend) and she bombarded me with her boyfriend, the man she left us for, being there.
Things continued and I tried my best for the sake of seeing my mum to just suck it up but I couldn't. I've always been quite emotional and this was just too much for me. I saw my mum maybe once a week when he wasn't around from then on but it was always when it suited her and him. It effected me hugely.
My school work suffered terribly, I bunked off a lot in secondary school and would just cry. I was only a child and I was absolutely crushed. I don't think I ever really got over it.
I got older and met my now DH and we had kids, she loved being a nanny but I still only got to see her once a week (if that) because he was very controlling and wouldn't like her seeing us in case dad was there. Eventually they broke up because she couldn't bare to not see the grandkids.
My dad never got over her, she's the great love of his life and even when she was with him - he would do anything for her - he adores her. For the last 5 years, mum and dad have been slowly rebuilding and are now very much seeing each other, spend all of their spare time together and have my kids together for weekends occasionally and they take them for lovely days out which is great. We have also been going on little holidays with me DH, my sister, the kids and my parents together.
Then Christmas came, mum and dad were coming to us, all organised and excited - she called me Christmas Eve to say she wasn't coming as dad was cross with her. My dad doesn't get cross - I've never seen him shout. Even the day he found out about the affair all those years ago, he just talked to her.
Turns out he found out she had been seeing the same man again for a few months.
I don't know what to do - I'm an adult now with my own children so I can't run and hide like I used to. I can't sit and cry in bed for hours feeling abandoned and sad like before - but I feel exactly as I did as that little girl all those years ago.
Anyone else - but not him. Why didn't she learn from the first time. Why, if she wasn't wanting to pursue a relationship with my dad anymore, didn't she tell him first before jumping back into bed with someone else again.
Now I don't know what to do, I just don't want to see her. She keeps calling me and I haven't answered which I know isn't the answer but I just don't want to talk to her.
I feel like I'm being extremely childish and regressing to how I acted when I was 9 all over again, but it's just bought everything flooding back from a childhood I look back on with great pain.