A guy said "she's playing coy",what did he mean?

Anonymous
this one guy from my uni, has been staring at me for like a couple of months.

actually, I didn't see a lot of interest from his part, appart from his intense eye contact and sitting near me,sometimes.

so he said this about me to one of the guys, I also know.

he thinks I'm "playing coy" with him.

what does it mean?
Updates
+1 y
(I apologise for my English,not my first language:) )
A guy said "she's playing coy",what did he mean?
2 Opinion