tldr: LTR (sort of, I won't be surprised if it turns out she cheated), she asks me to be friends, I refused and she crawls back, I lost my temper (biggest mistake) after that I agreed and even told her sorry

Most pathetic beta thing I have done in my life. How do I act? Just ignoring straightforward, pretending she doesn't exist? And the general question: is it ever possible to restore frame?