You fight with someone and sometimes carry those bitter memories for the rest of your life. But as time passes, you realise that you have burdened yourself with irony. And you decide to burn the bridge, move on and never ever look back. You carry on with your life.
Gradually, you forget about the fight. You don't even remember about why you fought in the first place. You keep on crossing the river and burning the bridge. Those burning bridges light your way and you have a really nice journey. But there comes a point when you realise that you have travelled a long way, but alone. You look back, now all you can see is a burning bridge. You can swim but to get drenched into the same water you crossed, is a complete torment. All you now see is a bright burning bridge.
What I'm trying to say is,
"Don't burn bridges. You'll be astonished, how many times you have to cross the same river."