I'm a single mum with a 4 year old DD. My ex, who cheated and lied his way through our 5 year relationship, left me for someone else, some time ago. To cut a long story short, I've developed an illness and my Mum has given up her career in the U.S.A and moved to London to be with us. She's renting a flat near me and DD. I don't know what I would have done without her. She's been great and wonderfully supportive.
A few weeks ago though she met a man who's married with kids, and she's been seeing him ever since. It is just a physical thing and nothing serious she tells me... Worst thing is, is that she's adopted this 'if you can't beat them join them' attitude about it all. I'm absolutely appalled at what she'd doing and she just thinks it's a bit of a laugh. Many years ago, her partner, my dad, walked out on us for a young woman and her other long-term BF cheated too.
I can't stop thinking of the harm they are doing to this man's poor wife and family. I love my mum dearly but I want this to stop. I feel responsible for it, as she wouldn't be here if not for me and this illness is hard on both of us. I don't seem to be able to get through to her though. Advice please!!