What does the “べつに” in this sentence mean?

Question

私の心はべつに先輩と高科さんとの間では揺れ動いたりしてないです。

What does the “べつに” add to the sentence? What does “べつに” modify or change about the sentence? What difference in meaning would there be if the same sentence was written without “べつに”?

Thank you.