Trust.

The most important bond two humans can share is trust. It's like water, easy to attain but hard to hold.

You can simply break it in a matter of five seconds and never have it with that one person again.

I watched my father's last divorce fail all because they lost their trust. I've see me and his relationship crumble because of trust. I've broken trust with a dear friend of mine once... but it doesn't make me a bad person.

I've learnt from my mistakes and I learnt the important lesson of trust which is, it only heals with time. And, in that time you can't break again, you can only be honest and let it mend on its own.