My boyfriend and I don't live together and only see each other on weekends. Why would he not text me past 6 pm when we are apart?

We only see each other on weekends and we both work on weekdays. He used to text me good night or check on my every night around 8 or 9. Recently he stopped with good night texts and doesn't check on me night. His most recent text said "Love ya. Feel secure. Sending secure vibes your way." I followed with telling him I love him and sending him a funny gif. I also told him I hope he feels secure too. It is Sunday and he didn't respond. His last text was at 6 pm and it is now 10 pm
My boyfriend and I don't live together and only see each other on weekends. Why would he not text me past 6 pm when we are apart?
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