Was he just using me to make her jealous?

Anonymous
Im starting to like this new guy but now I realize that he may have been talking to me acting all interested in getting to know me in hopes of making another girl jealous!

I noticed that whenever he was talking to me in class this girl nearby would give me dagger eyes. As if she wanted to kill me for talking to him.

Now after a few weeks I see him talking to that same girl and I swear I never saw them talk before even though we all sit nearby. He tells her "Long time no see" and they start talking like it's been forever but I dont understand why he didn't talk to her in the first week when there was no change in our seating for class.

Maybe im overthinking but I can't act normal anymore now that im starting to like him. Im not exactly jealous more like curious as to what their relationship is/was
Was he just using me to make her jealous?
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