Do we have to forgive no matter what?

yes we should.its hard but we should really forgive and also forget. even if the person who have wronged you didnt repent, you still have to forgive him. this is what God wants us to do.

Hell no. There are some situations where you should forgive. Sometimes (many times) it is not the case. But I don't remember now, will look for it later, but seems to me that christians must forgive, if it is right, then, well, if you are a christian you must forgive. But I will look and be sure about it. (thanks I am a pastafarian, and not a christian).

No, you don't have to forgive. I will never forgive the man who broke into my house intending harm to my two children because I gave them more than he gave his. He recently went to the small Emergency ward where my daughter works as a nurse, and what he did still effects her 25 years later. she could not be in the same room with him, let alone help him. Even after all the time, she still recognizes him as the man who hurt me while I was defending her.