According to the triangular theory of love, Brian is feeling infatuation or passion.
The triangular theory of love is the concept of the love that is developed by Robert Sternberg.
The theory basically depicts that love can be understood through three components that together can be viewed as forming the vertices of a triangle.
The three components in the triangular theory of love are the intimacy, passion, and commitment. As Brian did not show any intimacy and commitment in his attraction, then it is consider as the passion of Brian for Teresa.
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