I suggest you just b urself. If he does like you then you will know about it. If he glances over and looks you in the eye whilst smiling and holds his gaze for about 1/2 second. Then u r in. If he looks at you like he pity's you, then ur out.
If u wanna rele seduce him, wear something seductive and provocative. You say he dis-appears, make yourself noticed 2 him. With the calls make it sound interesting. When you meet him remember 2 do the bum wiggle
If u just wanna find out how he feels. Get sum1 he/they know to go covert and just try and get their m8 to stealthily find out how they both feel. I hope i have been some help. good luck