Not being able to live with someone out there that hates you is only one of the reasons for not wanting to totally dump someone. One of the others is the unpleasantness of the moment – we have strong social instincts that lead most of us to try and avoid conflict – causing another person bad feelings and seeing the result isn’t fun.
This is not, however, a reason to keep the person as your friend. You can first do the “lets just be friends” thing and then grow slowly away from the person. However, sometimes the lets just be friends routine is actually meant to leave you with a friend! Yes! People sometimes say the truth! Besides – any good socio-biologist will tell you that the female wants to win the male's support for her and her children – getting a friend is doing that without “paying” for it by commitment.