This guy's got my mind going crazy

Some guy that I've been talking to for about 2 weeks now is totally into me and I've seem to fallen for him. We both told each other the first day we met that we both recently gotten out of long term relationships and aren't particularly looking for anything serious just someone to hang out with and generally enjoy being around me. Since the day we met a lot has happened. We both opened up to one another and constantly continue to open up. We had made plans for tonight that we would hang out just the two of us and clear our heads. He was so into seeing me last night and I couldn't wait as well. This morning however he had a gut feeling that it wasn't a good idea for us to hang out because he's afraid that we've clung onto each other too much too fast. Where as he may be right I really find it unfair for him to completely cancel on me. No matter what I say he's still stuck on the fact that he needs alone time. Yes I understand that he does need it but why choose today to do that if not even 5 hours before he was telling me that he was excited to see me and missed being with me.