Not Talking To Your Muslim Brothers?
Islam does not want us to maintain an informal relationship with everyone, but a formal relationship should never be cut off. As long as you are greeting the other person when you see them, it is perfectly fine. This applies to all our relationships but we should be more careful regarding familial relationships. Since I do not have reference for the Hadith regarding forgiveness mentioned by you above, therefore I cannot comment on it in the absence of a Proper reference. As a principle , Quran allows a victim to take revenge from the perpetrator but encourages forgiveness. Please See : Quran 4:148-149, Quran 42:39-42 AND Quran 24:22 . We find the same encouragement of forgiveness in some Ahadith as well. For example, please refer to the video below from 40:23 to 47:25 https://www.youtube.com/live/y1dpQzqU9pg?feature=share&t=2423