He recognizes that there is nothing wrong with complimenting others in some situations but believes that if he were to give these compliments every time he experiences the urge, it would often be inappropriate. For example, complete strangers, professional situations, etc.
He controls these desires and doesn't respond to them in situations that are inappropriate, but nonetheless feels the frequency and intensity is unhealthy and excessive.
What kinds of underlying psychological issues might cause something like this? (Assuming the urge to give compliments is actually excessive.)