Sudden change in affection

I think I’ve been dumped and just overthinking here what I did wrong. I hope I can get some advice here to clear my head. It will sound clingy coz that’s the kind of person I am if I like someone but I try not to be suffocating in actual.

I dated this guy for a month and the time we spent together were great and I felt we have a connection even if I still felt insecure about being with him. He doesn’t give me the attention I need but when we do spend time together every week it feels like we’re the only people in the world. Then I went on a trip outside the US that I planned with my friends before I started dating the guy. I didn’t try to get him on whatsapp since I feel like I’m overstepping and he did not offer too. A day before the trip he was sweet and wished me well but three days into the tour I noticed he unmatched me. I could not get in touch with him until I got back to the US. When I did, I just texted “Hi” to get a feel of things and his response was a curt “How was Europe?”. He did not respond to my next question of how he was. After a while, I asked him if he is still interested in seeing each other but he has not responded. I guess he ghosted me. Should I attempt another text to ask if something is wrong? Or is this clearly ghosting. I feel like with the time we spent together, he at least owe me an explanation.