The dreaded "take it slow"

Ive been seeing this guy for a month and it was going really well, we talk every day, we are in the same career field and have lots to talk about. I have very high standards and this guy ticked all the boxes so i fell flat on my face. I wanted to move slowly and fought through the urges at first but one thing led to another and we had sex 2 weeks in. After that, everything continued to move at a natural progression and I still felt he was really into me, he'd plan dates and pay for everything. We booked a road trip for 2 days because we both love travel and I'm going on a solo trip next week and then the day before he said he didn't think it was a good idea and that he wanted to take things slow because he got burned really bad his last relationship by jumping in quickly and giving it his all. He said he would love to do it eventually just that right now it might not be a good idea. I told him I understood and that it had only been a month so i wasnt expecting anything serious... but why did he make the plans in the first place? He made plans to keep seeing me and we are going to the beach today but that took the peace and natural progession part out of it because now im super stressed (not showing it to him) and thinking he must really just not be that into me. He still texted me in the morning after that and talked about work as per usual. I really like this guy and now I'm super anxious and wondering what I did on our last date to make him back it up. I won't let him see how much it bothered me but I do plan on withdrawing a bit because I dont want to get hurt. What does it mean when all of a sudden a man wants to take it slow even when they were the ones moving at the speed of light? Where do I go from here?