Is he ghosting me or I am overthinking?

I am dating a guy for months now. We are in LDR but chatting on messenger every day. Last week he went on vacation and conversation slowed down (understandable). For few days I was the one initiating chat (before that he initiated convos too). My last message was a photo of something that reminded me of him. He read it, but did not respond. I didn't double text him (I did that before and even though he did reply sometimes, I got tired of being the initiator). And now 4 days have passed without any communication between us (he still likes my posts on social media and is occasionally online).

Note: before this everything seemed to be fine. Normal conversations, missing each other, he even made plans with me for weeks ahead.

Is he ghosting me? Should I text him, asking if everything is ok? Should I leave him alone as he is having his vacation? Not sure what to think about whole thing as he stated many times to me he is not playing games and he never did that with anyone. But as he didn't reply to my last text and said nothing in 4 days, makes me think I might mistrusted him.
Updates
+1 y
After almost 5 days of silence he reapperead. I ignored him for a bit. So he tripple texted me. I think he knew what was wrong. I was a bit distant and cold but through next couple of days we slowly got our communication back to usual tone & rhytm. He is getting back in upcoming days. We`ll see how it goes. I won't cross oceans for someone that doesn't want to even jump over a puddle for me.
Is he ghosting me or I am overthinking?
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