Wow! You did it! Your "best friend" just admitted to sleeping with your partner. I know it's a lot to take in all at once.
But I promise it will get better. It sucks finding out the ones you trust the most can do you dirty like that. It's not fair.
You don't deserve it. And don't think you ever will. The next couple of days, possibly even the next couple of weeks and few months, will be hard.
There's no doubt about that. But try to now surround yourself with positive people and ONLY positive people.
Do whatever else you need to do to remain positive and optimistic. Talk to your partner. Talk to your family.
Listen to music. Go to a spa. Treat yourself in the highest way possible. You'll make it through, I promise.
The End.