Answer:
Infatuated love. 
Step-by-step explanation:
Sternberg's triangular theory says there are 3 elements of love and they all can be present or not in a relationship, making 8 different kinds of love.
The 3 elements of love are: 
- Intimacy: Refers to feelings of closeness and bondnesness in a relationship.
 - Passion: Refers to physical attraction and/or sexual behavior in a relationship.
 - Commitment: This refers both to the decision in the short term to love one another, and to the long term to love each other and be in a relationship.
 
According to Sternberg, these are the types of love that can exists according to the presence or absence of the elements: 
- Non love: It refers to the absence of three components.
 - Liking: The only component present is intimacy.
 - Infatuated love: The component present is passion.
 - Empty love: The only component present is commitment.
 - Romantic love: It has the intimacy and passion components.
 - Compassionate love: There is intimacy and commitment.
 - Fatuous love: There is passion and commitment.
 - Consummate love: Has all three components. 
 
In the example, we can tell that the only element present is Passion, since they met only a week ago and they haven't developed a real feeling of closeness. The same way, they haven't discussed any kind of commitment.
Thus, this is an example of Infatuated love, since the only component is passion.