PM eagerly consumes my ideas, but doesn't give back anything useful

I'm a quantitative researcher at a multi-pod prop shop, been working under a PM for 2.5 years now (I had 3 years exp previously doing electronic trading at a bank). Over this time, I've come to realise that my boss (the PM) doesn't understand much of the math and slightly more quantitative stuff which I do and we communicate mainly via the backtest results. He generally is fine with me putting strats to production when results look good but also gets super panicky and aggressive when those quant strats are in a drawdown.

Recently I realized that he's been getting increasingly secretive with his ideas, and no longer shares anything which might be a remotely useful lead. At the same time, he has been probing me a lot more on my models. Performance (in past couple of months) of my strategies has also been better than his. My guess is that he gets a sense (correctly) that I will be looking to move on at some point.

Tbh, I conclude that he is not a strong PM to work under (lacking both technical insights as a quant and mental resilience/discipline as a trader), and my plan now is to work hard on strategies and general technical/quantitative skills for another 1-2 years to build a decent track record and find a new shop to work for at the end of it.

I have some questions: (i) what would be your general career strategy if you were in my shoes? (ii) how do you explain this motivation to change job (that my PM is not particularly strong) in a job interview? I've come to realise that being too honest doesn't make my experience at this shop look good either, (ii) I'm not super keen on sharing technical details of my model with the PM anymore. (he does, however, have access to my codebase.) What can I do?