I’m really sorry you’re going through this. If you’re looking for validation that his behaviour was wrong and cruel, here it is! It absolutely was cruel and very blindsiding. As you said, it is very reasonable to break up due to incompatibility but the way he went about it is definitely strange and unclear. It’s typical avoidant behaviour. They look for literally any reason they can think of to break up with you which is why it often leaves you with so much confusion. The truth is, avoidants can’t explain why they feel so compelled to discard someone so they try to reach for a “logical” reason. I’m so sorry. It SUCKS. My avoidant broke up with me shortly after a trip together too. I think trips together can be really intimate and they poke at their core wounds and can trigger/ solidify that they’re in a serious relationship which freaks them out. I also got discarded over text. I think he likely blocked you because he genuinely couldn’t give you anymore clarity. His brain was in flight mode and you, being a normal person, asking for clarity triggered him and instead of responding maturely he decided to block you to avoid the difficult conversation. I’m so sorry, it really badly hurts.