If someone is mean to me, ignores me, or manipulates me they have no place in my life. I've learned over the years to just cut off all contact and not give that person another chance.

It's never just one person's fault when a friendship breaks down either. So, maybe you could do some soul searching to find out what your part is, with how this friendship broke down with your friend. Were they ever a true friend or were they more of a casual acquaintance to start with? What was the balance of power between you two?

It's also not healthy to dwell on failed friendships. So, try not to dwell.