What does it mean when she mentions she has a boyfriend?

[Bars]

Even tho she clearly doesn't have one. I didn't ask her but I just heard her saying that she has one when someone said something to her and she out of nowhere said "i have a boyfriend"

What does that mean

 

[dbdrFanboy]

He is not attractive

 

[Cookie271]

She wants to see your reaction so she knows how you feel about her i presume