How do I get a guy I like to me to approach me again?

Lame ass question but I reallllly like him

So I'm in college right and like 2 weeks ago this guy in my class who's exactly my type ran to catch up with me after it ended. He started talking about how he thinks I dress cool and stuff but I'm really awkward and have no social skills so I panicked and kinda keep quiet, when I did talk I forgot all the social norms for responses and went on a rant about dog sitting (idfk)

Anyways I get to my car he's like "I'm kind of walking in the opposite direction of my car. I'd talk to you more but I don't have anything interesting to say." I lowkey didn't hear what he said at 1st so I just smiled and walked away ;_;

Then last week he walks up next to me and I just look up and don't say anything again cuz I'm a wimp T_T I want him to talk to me so bad he's smart and friendly and super cute but idk what to do...

Like how do I get him to approach me again??? I was hoping we'd be in the same group for assignments but nope. I also don't really have an excuse to go up to him, like what am I supposed to say? (if he even still thinks I'm cool)