How do I get someones attention!?

[Goneagain]

I worked with a guy for a few months, but never really had the chance to talk to him because of high work volume. I have since changed jobs, but I added him on facebook which is now the only means of communication. Heres where it gets odd, the last time he seen me, I had just healed a broken leg, and managed to pack on 55 lbs, I have since lost 35 of which. Needless to say I look completely different. I sent him a few very clear messages that I was into him, but nothing. Seems to me if I was bothering him or something that he would unfriend me. Anyone ever been in a situation like this? All I really want is a chance, Im not too certain if I harbor any feelings just yet, but first of all im extremely picky with anyone I have in my life, especially romantic interests, and secondly, I never back away from a challenge. I guess im wondering how I can get a 2nd chance, or if anyone has ever gotten one? Or am I just running on a treadmill here...