The guy has been patient for a long time... He couldn't believe in an affair with an alien. Now balance is broken. Being a innocent single in romance starvation, reaction is excessive. The tidal wave of passion is here.
Technical note: The alien may change color in some occasion. Great fury will cause the crest to turn into a menacing bright color. Rarely, a striking emotion triggers physiological disorder wich causes a vividly colored pattern of stripes an patches to appear. It is a primitive reaction of survival instinct. Needless to say, loosing control and showing such panic stripes is extremely embarrassing for a warrior lizard. Claiming to have seen fear painted on the skin is a major offense. One talking about this will probably face a situation. The information should be handled with extreme caution.