Guys if you knew a girl liked you in the end would you be nice to her?

Ok If you've known someone as a semi friend acquaintance for about 1 year and a half. You've flirted before but backed off when she flirted back. Stared at her lips and chest several times. But sometimes avoided her and other times still stared at her. You're are now moving away from this job. moving and will never see her again would you finally just act sweet to her. I was always so sweet to this guy but he's 23 and I'm 35. Sometimes he acted like he liked me, even the day before he left he ped me and tapped me on the shoulder. But the last day when he was leaving he couldn't even say good bye to me. From a distance in a really low voice he said see ya and my name. Was he that repulsed by me that he couldn't even say goodbye?