People are not "bragging" about their happiness, they are happy. And they wanna talk about it. So what? This is gonna sound offensive: but do you want the world be miserabe, just because you are? It was a work meeting... there are people who care, and marriage in family is big enough announcement to be considered big news... I bet all the money on my saving account that she is not getting married to rub it in your face

Why not focus on you? Snatch a bit of happiness for yourself. If you can't get a satisfying relationship... try at work. Or get a worthwile hobby to absorb... Learn the art of photography or master a language or learn to knit... Learning how to deal with too-bright-lighting or past present can surely take your mind from misery, at least for a moment... I know that, I've been there... And it's very satisfying to hear: "wow, you speak English really well," or "That is an amazing photograph!". It does miracles to your self-esteem to hear something like that.