for background: I am a second year Master's student in computer science. I had gone to the same university for undergrad. For my undergrad honors thesis (during last two semesters), I worked with a Professor on a paper which I had designed and implemented, and eventually wrote the manuscript for. The Professor was pleased with the work and the paper was submitted to the top journal in the field. This was over half a year ago. I stopped/withdrew from officially doing research 4 months ago, and two weeks ago the journal got back to us and said the paper can be accepted with major revisions.
The professor is excited of course, and I had told him that I would be available if further work is needed on this, but I honestly, honestly do not want to do research anymore. I am also in the processes of interviewing/finding a job among some other things, so I have a lot of things on my mind. But it would be leaving unfinished work that I started, and this seems very unprofessional. Since I worked on the manuscript/project alone, I feel like it would be a burden to him and others for me to just drop the paper because I'm "busy". It would also be going back on my word that I would be "available".
Basically, I feel bad. I'm not taking research for credit/graduation requirements, but I just feel bad. I have had trouble concentrating on anything for the past two weeks because this is constantly on my mind.
Question: How can I go about telling the Professor I don't want to work on this paper anymore? It is winter break right now, so I would be telling him over email. The professor is expecting me to begin working on the paper the second week of January.
Any advice or criticism is appreciated, thank you in advance. (Sorry that this is a child-like/emotion-based question, I'm not very good these types of things)