How to deal with this wishy-washy guy?

tshhh
I'm a college student and there's a guy who is in my class who is showing me attention but is acting wishy-washy. When he sees me in class he's always flirting and chatting me up and asking me to go out to events with him but that hell give me more details so we can set a date. I know were both really busy people, with work and organizations but he never gets back to me with the details until the next class. Nor does he put in effort to contact me outside of class to see how I'm doing. He's not acting like a guy who is interested and I DON'T have anymore time for BS. Anyway, I'll be seeing him tomorrow in class and I'm sure he'll try to make loose plans with me. How can I tell him not to ask me out anywhere else if he's not gonna follow through because I don't want to play games? Or is that fine as is? I'm not mad at him or anything and I don't want to be rude because he's a nice guy, I just want to let him know not to ask me out if he's not serious. thanks.
How to deal with this wishy-washy guy?
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