People change and so, hopefully, do you!
Maybe last week, you positively despised someone, but NEVER count them out as a potential ally and NEVER believe they will not end up your friend. Former spouses, previous romantic ties, siblings and other relatives may re-enter your life, but don't forget, you have the power to shape the relationship, too!
Even if you do not like the person, you do not have to make it well-known. Grit your teeth, smile and keep the time spent together short. Who knows, one day, it might not be so bad and you might decide to make even more of an effort to be friendly.
Not everyone will end up buddy-buddy, but even a cordial acquaintance relationship is much better than cold hostility.
Perdition: bwitchy-blond, A Second Wife