He disappeared

I have been dating this guy for less than a month. To be honest everything went really fast we spent de holidays together he told his family about me me too and he was the one who came on to me and talked to his family about me first. He said he has feelings for me I spoke to his mom on the phone everything was good. But this Tuesday we talked on the phone and I mentioned it would have been nice to meet during work or after worker just to say hello since we work for the same company but not on the same floor. He said no when he comes to work it’s only to work eventhoug he used to come get some coffee on my floor and he talks to people. He said me and him it’s something outside of work. I said I just wanted to say hi not flirt or anything.. I told him we can even meet after work just to say hello and I can meet him where he parks his car and he said u don’t know how to get there. So I dropped it and I said I wasn’t mad it’s just weird. He said don’t read to much Into this it was a phone conversation he told me he did not feel well because he didn’t sleep… we texted a bit but he was cold and dry even on the phone and I haven’t heard from him. It’s been too days now, usually we text everyday he sends me a good morning text and me a good night one
What should I do ? Why is he acting this way ? Should I text him?
Thank you