my ex girlfriend is now dating my best friend - Think of people you would like to forgive (your ex and your friend), as well as those you might have hurt and who would like to forgive you. . as much as it hurts, the worst you can say about your ex-boyfriend’s behaviour is that it lacked imagination and grace. I met someone nice, but within weeks i discovered that my ex and my best friend had started a relationship. There are rare instances when people establish a real friendship afterwards, but that requires a suitable cooling-off time first.