But this isn't about MH per se- the OP asked about people leaving their family, which is relationships.
Which is a serious weighty issue regardless of how it comes about (MH, economics, affair, etc)
snowdropfairy - I think you are very brave, your experience posted upthread was very raw and honest- I'm sorry life has dealt you this hand but glad you are coming through this- you sound like a very strong person.
mazfah - as someone who chose to stop her 17mo bfing (I was working FT, really needed to get my body back just for me, and DD was having her nutritional needs met fully through her varied diet)- I found it best to cut back daytime feeds first week (she had full fat cows milk in a sippy cup), then 2nd week I dropped the morning feed- I would take her straight downstairs for porridge/milk as soon as she woke, not even nappy change (
) so she would fill her rumbly tummy, then 3rd week I put her to bed 15 mins later so she was really tired offering cows milk in a sippycup, and saying 'Mummy's milk all gone' if she asked for bf.
She got the message very quickly, and never asked after the first night, and she was a complete milkaholic.
I hope it works for you... it made a huge mental difference to me as I wasn't chained to her 24/7 any more... which sounds just awful putting it in black and white, but it really does get you down after a while. At 17 or 19mo, they do understand when you explain to them that they're going to have cows milk now.
It does sound like you need a bit more support from your husband. Mine is pretty good when it comes to sharing parenting/childcare but even so there were times when I would have given anything to walk away, including thinking the unthinkable that you talk about in your 3rd post. It isn't rational thinking, but you know that, and you're getting help which is fantastic, and a huge step forwards.
It does get better- I promise. The first few years are so hard, they really are. I got out of the fog, then (oops) had another baby... but 2nd time round you sort of know what you're doing, and my 2nd child was a dream baby compared with my v high maintenance 1st child.
Good luck! 