Of course, there is always a reason, it isn't always the scathing rejection that we, and I can tend to take it as.
A lot of it is just how people communicate, which is poorly, and how they are taught to think about conflict. Me, I don't care what happened, or who you are with, just tell me, and it's cool. If it's long term, shorter term, it's more acceptable, but I never ghost or don't respond, I always follow through, and have the conversation.
What is worse than ghosting is passive rejection, where someone is responsive, and interested, but never follows through or follows up. That is my personal least favorite aspect of people.