First of all, I would like to tell you girls / boys,
always be honest to your another one, don't ever try to cheat on them, it will be a shit ass painful to see it happen when you see the one that who care most about you, feeling hurt, disappointed, heart broken..
The value of honesty cannot be overstated. Every time someone lies, the alarm bells aren't going to stop and that person's nose isn't going to grow larger, but something definitely will happen. Tell everything like everything is, rather than sugar coating everything.
If someday, they chose not to trust you with 100% trust, do not blame them.
They did nothing wrong to deserve the blame. You can only blame yourself for being stupid.
You won't know how much you love him / her, until they leave.
Do not let this happen in your life, once it happened, the scar on their heart will never disappear, no matter how hard you try to fix it, or patch it.
Appreciate what you have before it's gone.
What comes around goes back around, remember.
Treat them how you wanted to be treated.