When a guy you like doesn’t message back for days?

A guy I’m getting to know and he knows I like him.. is currently not messaging me back for about 9 days..! Is this a sign not to have high hopes with him and that he is not interested? I wonder if this is his way a silence to make me realize he doesn’t like me.
I’m sad I thought things were going ok and we are so similar both introverts etc
We have been knowing each other for 2 years I recently told him I like him. He says he likes me to, but due to his job he is currently away
Updates
+1 y
He messaged me today and called but I was sleeping 🤦‍♀️ so I didn’t pick up after my job will call him.
But he messaged saying this

“ I’m so sorry not replying you back for 1 week, you know my grandmother died last month month , my grandfather passed away too.. and I was at my parents house. I know you have big exams to take and I didn’t want to worry you. Have have you been are you ok?”

I guess maybe that’s why he didn’t contact me for so many days
When a guy you like doesn’t message back for days?
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