It's pathetic of me to use a person to prevent me from taking a class, isn't it?

This person and myself really wanted to take this class together, but we got into a fight. Now, we are seriously strangers to each other. I have the oppurtunity to take this class, but I found out this person is also planning on taking the same class at the same time and everything. I was totally okay with having this class together until my friend told the person I was taking it, and the person’s response was “she’s dead to me, she doesn’t exist in my life.” I shouldn’t let words stop me right? I wouldn’t know how to face the person if I ended up taking the class.