How do you know he deliberately didn’t reply versus just got too busy? Did he tell you? If he deliberately did not reply, it’s quite a nasty move and isn’t someone you want to be with. That’s quite asinine

Saying “we should go on a mini trip” isn’t the same as “inviting” anyone anywhere. Inviting would be “make sure you free up days from 15th to 20th as I booked us a trip” or “let’s sit down now, let’s look at a calendar and book a trip now”. Otherwise it’s just a general chit chat.

Overall it’s better to pay attention to actions more than words.