Alistair is grown man responsible for his own decisions, but obviously smitten by Denise. Denise understands this and I think a little unkind, the way she is messing him about, but at the end of the day up to Alistair if the pain is worth dim hope.
Alan is so indiscreet blurting out about the potential service to Fallon (let alone in public) when it was obvious during his discussion with Harrison, that Fallison were on very different pages and were having difficulty communicating about this very sensitive matter.
Of course even the thought of a public service for something so deeply personal to her must be Fallons worst nightmare on so many levels. The thought Harrison was planning this behind her back horrifying.
But also feel sorry for Harrison who seems totally lost in his grief for what he sees as his lost child. I agree this has moved on from the accident and murder, to be fixated on the loss and unable to move away from that.
I don’t think his perception is biologically naive as has been suggested, given fertilisation is a very specific event that marks the casting of the die in creation of a genetically complete and separate pre child with its own heartbeat 3 weeks later. The very start of a human being. He is likely continually visualising that child and mourning its loss. It is just his emotional response as an individual. Many others have very different feelings or views, but that does not invalidate his feelings, which seem very heartfelt.
Perhaps lessons in how the coil cleans up its few fertilisation prevention failures by preventing implantation or even causing post implantation pregnancy loss would bring him down to earth a little and see things in the more practical realisation that this is possibly not the first time this has happened. The very many spontaneous losses of very early pregnancy obviously another factor.
Fallon has made it plain she does not really want to discuss this, and he also has started conversations then walked out. I don’t think this is necessarily petty or deliberately cruel on either side, but really both avoiding the elephant in the room on what is a major life issue on which they seem diametrically opposed but which has little compromise ground to support their future relationship without one side capitulating, which have we have seen is not necessarily a particularly good solution.