How about serially complulsive or serially obsessive? From M-W:
compulsive: of, relating to, caused by, or suggestive of psychological compulsion or obsession
obsession: something about which one is constantly thinking or concerned
obsessive: caused by or suggestive of an irresistible urge
Your example:
"Remember the two years you spent learning ()? And then you spent three years learning (). You focus so much I whatever you are interested in. John, you are so serially compulsive. I'm just not ready for that much intensity...about me."
"Remember the two years you spent learning ()? And then you spent three years learning (). You focus so much I whatever you are interested in. John, you are so serially obsessive. I'm just not ready for that much intensity...about me."
