because one day it will be you and it will come quicker than you think
and even if you swear blind you'll never be like that, you will , even to yourself I used to think, seriously, quit grumbling and enjoy...(I was TTC after mc and I missed out on 3rd tri 1st time) but sometimes you just have to vent. It can quite lonely and it feels like no-one understands.
But, I COMPLETELY know how it feels when TTC too its rough.