He ignores my invitation. Why?

So I met this guy in the university a month ago. He invited me to his house and he cooked for me. We hit it off almost instaneously. After that, we chat everyday for 3 weeks. During that time, I invited him to come to my friend's gathering and he declined politely by saying he is not in town that day. About 4 days ago, I invited him again to an event but he never replies and we stop chatting ever since. Am I coming too strong and scare him? Or does he lose his interest? Should I just text him again and say hi?
He ignores my invitation. Why?
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