It appears that if you show the slightest bit of interest in a male person, he will begin to dissolve before your eyes until there is nothing left but that cartoon cloud puff out line where he once stood. This would not be a problem if there was not such a shortage of hump-able men around. But these days guys are evaporating at an alarming rate. There may be several factors that cause him to flee like a nervous rabbit, and there are some countermeasures you can take. Male Linear Thought Process .
Some men use very linear thought processes.
This will only be confirmed by any actions you might take such as smiling at him. The only way to prevent this is by not allowing him to have a few minutes to think about what just happened. Try turning on ESPN or making him change your oil filter. This should keep him distracted. Some guys have been led to believe that women will only sleep with guys they have true and deep feelings for.