But, to my mind, it should not be a universal, indiscriminate behavior. I think it is legitimate not to forgive sometimes. It depends, of course, on the severity or duration of what was done to you. Life is too varied to succumb to rigid principles. Your friendship must not mean much to you if you give it away so easily and so profusely.
Friendship is a gradual thing, based on many trials and errors.
It is profound and, at its best, it is nourishing and supportive. Conflicts are an important and integral part of life. One should never seek them out willingly - but when confronted with a conflict, one should not avoid it. It is through conflicts and adversity inasmuch as through care and love that we grow. Some people will always dislike you.