Guys, Is he not interested in me any more?

Hi guys! I started dating this guy from work. We have been dating for two months, he initiates contact most of the time if not all the time, and he proposes nearly all dates. In our dates, I have a lot of fun and we are all the time laughing at each other, making jokes etc, so everything seems good, and he always sends me a text right afterwards. I didn’t sleep with him yet even though he has made several attempts to come into my house after dinner, which I kindly rejected.
The thing is, I have noticed that since last week he has been texting me less, and also he has been taking a long time to answer my texts, even 24 hours sometimes. He asked me to meet on Thursday to say goodbye because he is going on Christmas vacations, we had a great date but he didn’t text me afterwards, now it’s Saturday and he hasn’t texted me yet. It’s the first time he doesn’t text me and we have never been that long without talking. Do you think he is loosing interest or maybe he is waiting for me to text him and be more proactive, since he is taking the lead all the time? Thanks!

Guys, Is he not interested in me any more?
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