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"PU stuff", is waaaay too broad. If by "PU stuff" you mean: advice regarding bettering yourself as a man, then yes.
Of course you want to read up on sexuality and to enhance your sex life. Books about finding and defining goals, and achieving them. Books about being a man and how to become an even greater man (spirituality).
If by "PU stuff", you mean: learning negs, push/pull, funny one liners, routines, etc, then no. I hardly read that stuff when I'm single.
Getting over approach anxiety is still good. I think for any man to grow you'd need to learn to handle your anxiety's, and having a great social anxiety like approaching other human beings will cripple you A LOT in life.
But what you're basically asking is: "Should I still improve as a man when I'm in a long term relationship?", and the answer is yes.
Thanks for the advice. I didn't really know how to ask this question thats why I used ''PU stuff''