Beta losers

The warranty expiry date has been and gone and no-one even noticed
But all our friends were there when you broke down

Since when did our relationship become obsolete?
I'm sorry if I thought that the equation would always be you plus me

Now I feel like I've been dumped but I've been superseded

You were the pride of every lounge room once
But now you've found out that you're worth nothing
That you're worth nothing

Now each of my arguments you laugh at but it's still a superior format
I might only have five videos to choose from but I can still tape off TV

Now I feel like I've been dumped
I feel like I've been dumped
What's the difference between dumped and superseded?