Met a guy over reddit - he suddenly stopped talking to me

I met a guy over reddit few weeks ago. We both talked about our workplace issues, about mba entrance exam prep and few other things. He mentioned he liked talking to me and so did I.

But he never told me his name or anything about his identity as he mentioned how people spend a lot of time in the beginning to get to know each other and this might be a distraction since both of us are preparing for mba entrance this year.

Few days ago, he texted me that this texting consumes a lot of time and energy and he feels exhausted and he doesn't have the bandwidth as he needs to fully focus on his preparation for now.

So he stopped talking to me and mentioned how he is still interested in being friends after the entrance exam in November.

I want to understand a guy's perspective here. Do guys leave everything to focus on their career? Am I being unreasonable for feeling bad about this situation? Is it okay to sometimes prioritise career in our 20s and leave everything else? I feel there could be a balance but would like to know a third opinion.