Long story short, I was reading my supervisor's recently published article and noticed that a whole paragraph was almost identical to a section of my thesis. I went back to look at the edits that he and I exhanged while working on it and it is fair to say that he made a lot of edits but at the same time it was based off of my writing. There are a few sentences here and there that he added but there are also some that were only slightly edited off my original writing.
I am very conflicted because I have a great relationship with my supervisor and do not think that he is the type of person to take students' work. How do I resolve this situation? I now feel the need to massively edit my thesis because I don't want to be charged for plagiarism. But at the same time I don't want to do that because it has been polished to its current state and I like the flow of it.
We have a good working relationship so I think I want to talk to him about it but don't want to sound like I'm accusing him of stealing my work. He was a big part in building the idea and editing of my writing so I don't know how to approach this situation. He could argue that it's his idea and edits. I don't know if he wrote the article before or after editing my thesis. It could be that he did it unconsciously...? I know that I sometime write in a similar way if I've been writing on a similar topic.
I wonder I should talk to other grad students in my lab, but don't want to color their perception of our supervisor.
Any advice would be appreciated!!