The truth about life is, friends will come and go. For whatever reason they leave our lives, it can be hard to understand why and move forward. Friends are forever, right? Unfortunately not always, so that's why these 20 inspiring quotes will help you heal when you lose your best friend and you're finding it hard to get back on track. Because many of us will experience loss at some point in our lives - whether it be grief from death or sadness from a failed friendship - so it's important to…