If it's been a few dates I understand but when it has been months of dating it just seems so rude. Why can't men have the decency to tell a woman they are no longer interested or that they don't see eye to eye on things?
Because some people are cowards, they don't know how to talk to you to your face. Unfortunately, you will never be able to get closure, just try to pick up the pieces and move on. You weren't worth his time to talk to you, don't let him waste yours, thinking about him.