Guys, "First date"= me, him, his friend?

Guy: "x" night I will hang out with a friend (male), would you like to come?

I want to say that we see each other at School but we only spoke once (recently) we had a long conversation and he asked for my number

Why to go out with him and his friend and not "one to one"?
Guys, "First date"= me, him, his friend?
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