Why hasn't he replied?

I have been dating a guy for 5 months. I've fallen for him, and I know he has commitment/abandonment issues. I thought I could continue keeping things casual but I can't. I poured my heart out in a message and told him I mentally can't do whatever it is we are doing if things are not going to process further. Its been 24 hours and he hasn't replied. It hurts that he hasn't even acknowledged it.
Why hasn't he replied?
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