Help me understand, please?

I was talking and texting with a man for years. (Long distance and never meet in person, but we had plans to meet and talked a lot about being in a relationship etc) Everything was going well. We texted daily, but one day, I woke up, texted him "good morning," and in less than 5 minutes, he replied, "Good morning," then after that we exchanged a few messages joking and laughing that same morning, everything was fine! But when I was going to text him something around 5 pm the same day, I saw I was blocked on whatsapp ! Just like that ! I'm embarrassed to say that I called him (regular call) but didn't respond, and I left a voice mail, 2 days later I called him again around 10 pm and 30 minutes later he texted me (regular text) "Don't comunicate with me again, thanks" and after that message I stop contacting him. I have no idea what happened or why he blocked me, but a month later, he unblocked me on whatsapp, but it's been a week since he unblocked but he didn't reach out (I'm not going to reach out, I'm respecting his wish and acting like I didn't even notice. But why? What does all of this mean?
Help me understand, please?
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