why was he only interested in me when he had a girlfriend?

[CarlaHowell]

so when he was with his gir;friend he would text me, tell me i was beautiful, that he loved me, and we met up and he would hold my hand, put his arm around me and hug me, since him and his girlfriend split up he has lost all interest in me, fair enough he has lost his phone, but he said he would inbox me his number, i posted on his wall to inbox me and i inboxed him, and he hasnt got back, and i know he was on yesterday...and today when i gave him his birthday present he just goes ' bet i can guess what it is' and walks off with no thank you or anything. why is he suddenly treating me like crap?