You bumped him... If I am caught in an open area with a bird that is not coming, I either wait him out, or wait for him to move into an area where I can move on him (or better yet get around him).
GuessWho gives some great advice, as does Eggshell...
"Hunt like you are being hunted." Spot on... Move around the woods like you have something to lose if you are heard or spotted.
EggShell: Learn from your mistakes but do not dwell on them. Second day of the season, I bungled two good opportunities. Next time out I had a coyote screw me up.
I tend to push the envelope more (and bump birds) when I have limited time in the field, and tend to be more successful when I have nothing to do the rest of the day...
And... Moving towards a bird is not always the right direction (although many times it is). I have moved parallel or even slightly away from a bird to gain their interest. Sometimes a traveling hen will create more interest (and less apprehension) for that tom to come in.
I always try to remember to have a plan when I move on a reasonably close bird. Can I cut him off, and where do I want to set up that he is likely to come? I might set up in further away from the bird but in an easy path of travel, as opposed to closer to the bird with a bunch of obstacles in his way.