The question is not about plagiarism, it is about its aftermath. I am presenting the whole situstion.
Three years back, in my undergraduate years (summer after sophomore, to be precise), I did my first major project with a professor in India. The project came out well and we had two publications next year.
Obviously happy with my work, the professor offered me another project, next year, which was entirely different and of higher level of difficulty (he had his graduate student working on it). He asked me to do simple simulations and mostly literature survey so that he could later use it. He also proposed some survey papers (all by same author, call him X) to start with. I wrote the survey section based on the papers mentioned in the citations by X, and added reviews of another dozens of paper. I cited all survey papers by X and cited others too. I also did certain simulations.
Meanwhile, he provided me references to land into a Masters program at one of the top 5 electrical engineering programs in the USA, and I will be forever indebted to him. After I came to USA, he had his graduate student worked upon the project and submitted a paper (I was surprised to be listed as co-author) including the survey section and simulations I did an year ago.
One of the reviewers pointed that the survey section has been almost a replica of X's works. The reviewer added that, although X's works has been cited, word plagiarism is still relevant. I got disappointed and wrote my mentor and email apologizing for letting him down. He didn't reply.
Now, it's been six months since the review came, and I really wish to reconcile with him. What can I do ?
The plagiarism was using 3-4 sentences from various papers without double quotes but properly cited. Also, half of my citations were same as X's works. It happened because, my survey was about major techniques in a field while X's surveys were about techniques in a subfield of the field.
I emailed the professor only once. He didn't reply and I never emailed him again.
I never knew how my section was going to be used because the project-work was incomplete. When his graduate student finished the work, he immediately submitted the paper and informed me after the submission. I should have got time to review something I did an year back.