I am a bachelor student. I have been working with a PhD on an article. So the article was supposed to be co-authored; however, he was mainly going to edit my draft so it can be published. This is, the content of the article was actually my work, while the edition was going to be his part. I have e-mails with all the drafts I have sent to him until the final draft of the article. In these e-mails, one can see that he mainly suggested me to clarify some ideas or was trying to understand the ideas I was pointing out.
On the other hand, we have stopped working together. Thereby I sent him an e-mail, by recommendation of a professor, asking him if he had any inconvenience if I used my drafts for my bachelor thesis (in my country one first obtains the bachelor degree and then one must present the thesis). He answered that my drafts remain my work and that because of this I am free to use them.
The question which I would like to ask is if there would be any inconvenience if I wanted to publish this draft in a journal as long as it is actually my work. People have told me that as long as I have this e-mail where he is recognizing that my drafts remain my work, I would have no inconvenience, however, I wonder if this is enough for I did not ask him about using my drafts for publishing but just for my bachelor thesis.
I am wondering if he could accuse me of plagiarism if I would publish my work. I think that he could not do so because he has written to me that my drafts are my work and thereby I am free to use them. Besides this I have all the e-mails wherewith I could prove that the drafts are totally my production and that his contribution was mainly motivation and making me some suggestions or comments so that I can better clarify myself. Would that be enough in order I can publish my work without any fear of being accused of plagiarism?
Sending him an e-mail asking him directly is not really an option, for the relationship of work has gone deadly bad.