nostalgia

Feeling sentimental today in my home town where the N and I met.

How does it happen that two children meet, we were both attractive, educated, smart....the envy of so many, against the odds survived almost twenty years, had a house, business, child.....

Now, he's a drunken, drug addicted piece of crap dating his 52-year-old drunken, craigs list mistress fighting me for custody and his licence back, living in a shitty apartment.....
I'm a broken down 40-year-old with sole custody and not a pot to piss in..........

How the hell did this happen within a couple of years?
And why am I the only one who cares? How could he move on as if nothing happened?