My Enemy is My Destiny (On-Hold)

What if one day you'll meet someone you thought your enemy .. cursed him/her to death and all.. push him/her away to your life and wished that he/she never exists..

But time passes by ..
fate is such a playful thing .. That someone you thought your enemy, was totally your destiny..

Would you go after him/her and get him/her back or
just set him/her free and look for your another destiny ???