Save the Date Confusion

Looking for a sense check. Yesterday I went out with a few friends and gave them the official wedding invites. I'd given 2 of them the save the dates several months ago and they said they still had them. One of them has gone to check their phone and said that both of them are in Poland for a hen do. They then went on to start saying that they both were sure it didn't clash with my wedding as they'd apparently discussed this before confirming the hen do dates for another person as they were worried it would clash. They then said they would see what they could do... My confusion is, if they were that worried between the 2 of them, surely at least one of them could have thought to just check the save the date or contact me. Am I overthinking this? It's upset me as Im feeling I've been potentially lied to and now considering stepping back from making any effort in a friendship with them.