I’m trying to platonically befriend a girl in my class but another guy who very obviously has a crush on her keeps trying to interrupt?

It’s getting really annoying, we all sit at the same table and every time I try to talk to her he tries to join the conversation. If I try to tell her stuff about myself it’s like he’ll always try to find some way to butt in and change the subject? I literally just want to her friends with this girl because I think she’s cool, I have absolutely zero interest in her romantically, but I’m 90% sure this guy is getting jealous and trying to stop me from talking to her. We were sitting next to each other at lunch, and I gave her one seat of space between us because I didn’t wanna invade her personal space. Other Guy is sitting at the opposite end of the table, mid conversation he comes and plonks himself right between us without asking because quote “his seat was uncomfortable”. He then starts trying to talk to this girl, completely ignoring the fact that I was in the middle of a conversation with her. Like c’mon dude
I’m trying to platonically befriend a girl in my class but another guy who very obviously has a crush on her keeps trying to interrupt?
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