Should I call friend out on being one-sided, or should I just passive-aggressively say I'm busy (when he needs help)?

My friend never joins me in a hobby we both like. Recently he found out I was taking lessons in that hobby. Now he's interested to learn from me what I've been learning. I told him I really need his help too asap with that hobby. So he said we could do it together soon. But then later he said he would join me several weeks from now, and not soon. What should I text him when he comes around after letting me struggle along alone over the next few weeks? "Sorry, but I'm busy now"?

Should I call friend out on being one-sided, or should I just passive-aggressively say I'm busy (when he needs help)?
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