Read the following context and answer the question.
Context: How could you say that ? Okay .... so maybe I am bitter , but do n't even try to tell me you would n't be . They always sit so impossibly close , as if they ca n't stand staying away from each other . every time we go on school field trips , my friends and I find seats near each other on the bus .
Question: What is a likely reason that the speaker feels bitter ?
Answer:


They notice the proximity of the other students to each other and feel jealous