I have known a couple of "professional students" over the years. The first one I met before I had a CFI. He had almost 200 hours, but had never been legally soloed. He always wanted somebody with a private ticket to ride with him. I found out later, He was getting his confidence up then taking off by himself and with passengers, when he wanted to. I thought this was VERY bad for me because if anything ever happened, somebody would say I was giving him instruction. Then I would have to hire a lawyer, etc....
The second one had a Private SEL, but no Instrument rating. He trained for it a lot, but could never seem to get signed off for it. I worked with him for quite a while until one day I heard him in his airplane, IFR, IMC, on a clearance, in the same airspace with me. I found out that he was filing and flying on his own. He would just turn on the Autopilot. What's even worse, a couple of years later, he called me to go to APA and pickup a Seneca that he had bought. I did something dumb. I didn't ask if he had a MEL yet. When I delivered the airplane, he asked me if I would give him dual in it. That's when I found out he still didn't have even an Instrument ticket. I considered this a serious as an ambulance with slick tires in the winter.
Needless to say, I did the hot potato trick with both of them. I don't know if you should report your guy or not, but I think you would be better off being to busy to fly with him again.
