Boy friend (not boyfriend)

So this boy at my school has been talking to me and we're pretty good friends. He wants to hang out outside of school but I really don't want to. I've been dating the same guy for over a year and people have been spreading rumors about me and this boy at school. I don't want the rumors to worsen with us hanging outside of school. Plus, he's the type if someone asks "oh so you got laid right?" He'd say hell yeah even though it never ever happened. I'm so not comfortable with hanging out with him. He wants to hang out today and I don't know what to say. Like I already made up an excuse why I couldn't last weekend and I'm scared if I make up another one he'll see right through it. Help please 😭