Why did he block my number but still dms me on instagram?

I met this guy online in Nov-Dec 2023 and began dating long-distance (7 hours away). We hung out once in person in Feb 2023, and things were fine all throughout that time. I moved closer to him for school in March, and we began living together until June. He proposed to me in May. We had some conflicts but were able to resolve them. I left because my family told me my mom wasn't doing well, and I also got dismissed from school for other reasons. He didn't want me to leave since I was taking care of him, so he came to my city the next day to meet my family. They didn't like him since he was hyperfocused on me returning to his house. I decided to stay with my family for the time being since they wanted to throw a little ceremony in September, and I would move out then. Plus, I needed my family post-dismissal since I didn't know what to do academically, and my mom needed me to care for her. I didn't think deciding to stay with family was terrible, considering they were still trying to build a relationship with him even though they didn't like him.

He didn't like that I chose to stay with my family and gave me a hard time afterward. He claimed that I was going against "God" and tried to tear me down in any way he could, mentally and emotionally since he was now alone. I empathized with him and reminded him that I would be back in September (after leaving mid-June), so it's around the corner. He claims "it's too far away" and said he doesn't even want me to come back or visit even though he claims I'm "not watering" us. We fought about it on a phone call since he couldn't move on from my decision even after all this time and blocked my number. He said we shouldn't be talking since he's "not happy" but proceeded to send me reels on Instagram and told me last night that he was reminded of our love for one another with an "I miss you" today. I asked him to unblock my number so we could talk, but he said no. I don't know what to do or what this means at all.

Why did he block my number but still dms me on instagram?
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