How to keep a guy friend when you have a boyfriend?

I have a boyfriend and just met this guy last night in my class. We live in the same apartment and I will have to see him every week in class for the rest of the semester. He asked me for my number and I gave it to him under the pretense of being classmates.

How do I respond? Thank you!

Text below

"Hi Lavelle, this is A from the film class. It was nice meeting you today!
I think you are pretty cute and I was wondering if you would wanna get something to eat sometime?"

How to keep a guy friend when you have a boyfriend?
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