Errol, she will find anew shop assistant. BUT what she has lost is her best friend, and the person who can protect her - to a point - from BadRob. In some ways I can see why H didn't tell Kirsty about Tom's worries, apart from it being his job to tell Kirsty if he was having doubts. But probably nobody expects this - we caught the signs and put it together. From the other characters' view it was all going as planned more or less. People don't consider it/jilting will happen in their family/social circle. Helen was also a tad wrapped in her own affair/s. 
I find it a good sign that Kirsty is so angry. She isn't blaming herself. Hopefully she can recover. Pages ago somebody said she hasn't been humiliated and people will all have sympathy for her - but to her it must be a huge and public humiliation. I hope Patrick isn't another lame duck. Maybe a totally new character would be better.
I think the Bridge Farm scene was good. All the others in shock, terribly upset for Kirsty who they all love, and very disappointed in Tom. Maybe when the dust has settled Pat (and Peggy?) will be kinder to Tom. Tony was harsh but it had to be said.
Maybe it WAS all in his mind that he was expected to 'shadow' John, but I think that was how he felt inside. He did take on the pigs after showing no interest. He was very young and shocked when John died. He was never portrayed as anything else - just a vaguely Casanova pig entrepreneur. Maybe his frenetic activity and obsession with pig husbandry was all a reaction, trying to be something he didn't deep down want. And, like his dad, wanting his mammy to love him.
They were all so damaged by John's death. I think it is realistic, even if the lines and dramas are a bit odd at times. Tom is still a selfish bastard though. I felt only fleeting pity for him.
Ach, tis only a story. Good night, all.