Boy help please

So I have been dating this guy and a little over a week ago lost my virginity to him (I am 19 btw). I really thought I liked and trusted him a lot, so I was happy to experience that with him. However since then he hasnt put in any effort to see me, like he will text and say he wants to get lunch or whatever, but then when I agree and ask what time he just wont reply for hours and then apologise and be like ‘sorry had a busy day’. This is the third time this week this has happened and I dont know how to feel or why hes acting like this. I am getting pretty angry and I know hes not even doing anything in this time either (snapmaps says he is at home). What should I do? And how do I say something to him without seeming like im overeacting because I dont want to blow this over something kinda small. Please help!