Distant after kissing?

So two weeks ago I started dating this French guy who I saw 3 times that week, after the second date he messaged me saying he really liked me and wanted to kiss me and so on the third date he finally did... since then he’s been distant with me through text when he usually used to message quite frequently and more lovingly. He’s said he’s been busy with things and that he’s sorry for the lack of messages and I’ve been understanding but inside feel a little insecure. He made plans to take me to the museum this weekend and this will be the first time we’ve seen each other since the kisses two weeks ago. I guess I just feel about the lack of communication and so am worried the dynamic may have changed, has this happened to any of you? Am I being silly or is there something I should do? Thanks guys, sorry if this was long!