If their relationship is young, I find it understandable. However, if it seems that they are feeding off of other people's aws and oos, I find it rather odd, even annoying.

I am a romantic, and so understand how some people may travel a path not exactly asked for when discussing things, but even then, there is a point.

At any rate, it seems to be that they simply want to talk about them, to no one in particular - just someone. When some people are excited - even jubilant - I have found that it's not uncommon to ramble on about it. A simple nod, yes or no, aw or whatever is sufficient really. If they are so wrapped up in their little fairy tale that they are spouting it out at any open moment, your disinterest doesn;t really matter. It seems they are speaking more to themselves than you at any rate.

If it's post, simply ignore it.

As MILF sated, let 'em be happy. We all desire happiness in one form or another, so let them have it.