Why did he not call or have a bad pattern to follow-up calling?

Talking to someone for a month. Everything was honey moon at first where we talk everyday on call. Then he said he got super busy and rarely called me. I called him out on not following through for quality time while being hurt about it. He said he need time to think. He came back with a big apology on text how he hurt me, and how he only wants me & just me. I asked if he’s free to talk on call the night or next night after work. He said next day, but then didn’t text me all day until he’s off work to say he can’t call because his brother needs his help at his house. I just stopped replying tonight and left him on read because this is becoming a pattern when he knew it was to talk about us.

I don’t understand why even write me a big message of an apology and wants me yet can’t even call me to talk about us?
Why did he not call or have a bad pattern to follow-up calling?
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