I think the issue is OP that most of the time people have their own stuff going on and, even if it would be a nice thing to do, don't think to help others with theirs. The same way you were thinking about your issue with your path and didn't consider whether your neighbour currently has any particular issues he could maybe need help with. This isn't people doing something wrong, it's just that no-one has enough time or headspace to try and envisage and preempt every issue that everyone around them might have, be that parents, friends, children, colleagues, neighbours.
In this instance, you in your own head wanted help with your path and despite not communicating this to him, were suprised he didn't help. But consider you had decided you wanted to go shopping but because it was slippy and your husband away, it was actually this issue you wanted help with. Unless he KNOWS what you want help with, how can you expect him to help.
Maybe in future, if you need help, just ask for it. I'm sure, if you've got a good relationship he'd be happy to help you out. Expecting others to anticipate the second we need help despite them not possibly having any knowledge that we help is needed is unrealistic, a bit unfair and setting yourself up for a fall.
Sorry for the essay!