Dating - ghosting question?

I am dating this guy for about a month now. He is very kind and it seems that he is that into me. I mean we had a really great time together to all our dates, he has told me that he missed when I was out of town etc... But the last 4 days I decided to text him first and he never opened our chat. I guess I did something wrong or something that made him reconsider. He may be also busy with work but it seems too much to me to not respond at all for that long if the reason is that. I am sad about it but it seems that I should move on and try to date an other guy. But first of all I want to ask him what I did wrong. Is that that bad or does it makes me look needy? Also we were planning a short trip together. Should I ask him if those plans are still on or canceled?

Dating - ghosting question?
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