I think one of my schoolmates have a crush on me

Well today on first period class the teacher let us free time, so I was making homework and transcribing notes, when suddenly I heard a conversation of one of my classmates that asked to this other guy I used to have a little crush on him, if he had a crush on someone, he answered that indeed he had one, then the one who asked question him again "Is it someone from this class?", "Yes, on Susan" he replied, I was as amazed as he was (the one who asked), and replied "But she is ugly as f*ck, dude", after that I didn't hear a word, I don't know if it was because I was blushing or because I didn't want to hear the rest. There was a lot of noise on the classroom during their chat, so for sure they think I wasn't hearing but now I don't know what to do, he indeed was trying to approach to me, I though it was because he seems like one of those classmates that want me to integrate.