What should I do after I confessed my feelings to a guy?

About two weeks ago I confessed my feelings to a guy who I’ve been having a crush on. He’s a senior in college, we were in the same chemistry class for a semester and had worked on a research project together but we didn’t really talk much other than talking about the project.

I did not get rejected but he isn’t exactly telling me that he likes me or he does not. We’ve been texting on and off, really getting to know each other and he always texts back within 2 minutes, however, he never texts first. The last time we texted was 4 days ago and I feel like I’m walking between the line of desperate and shameless.

Any advice is appreciated.