I have been dming with this guy from the college I'm going to go to and he seems really into me. How do I keep him interested without being desperate?

He requested to follow me after I just followed him in insta (I have a private account and his is public) and he has been making the conversation not end for like 3 days! He also said "we should absolutely hit the gym together" and that "we should definitely meet up at the open house" out college is going to have in about a week. What should I do until we meet up and what should I do when I meet him? How should I act to seem interested in him but not too desperate or too not interested?

I have been dming with this guy from the college I'm going to go to and he seems really into me. How do I keep him interested without being desperate?
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