My (19F) talking stage (19M) is behaving oddly after our first date. Am I in trouble?

Hi Reddit, I don't have many people to turn to for advice, so I’d love to hear your thoughts on my current situation. I’ve been chatting with someone in the talking stage for about a week and a half. He's got a busy schedule, so he can't always reply right away, but he does find time during the day to keep in touch, which has been really nice. We recently went on a date, and I thought it went really well! It wasn't awkward at all; we had great conversations, and at the end, he gave me a kiss. Just five minutes after I left, he texted to say he enjoyed seeing me. However, since that date, his responses have drastically slowed down to just 1-2 messages a day, while we used to text more frequently. He mentioned he has a lot on his plate right now, but I can’t help but wonder—does that really prevent him from sending quick replies throughout the day? I made it clear that I want to get to know him better, and he said he "wouldn't mind meeting again." I’m starting to feel like something is off. Is he losing interest after our date? It's been a week of lackluster replies, and I can't tell if he’s being honest about his situation. I know he doesn’t owe me anything, but this leaves me feeling really confused about how to move forward. Any advice would be greatly appreciated! <3