!! Ddouble ~ Ttrouble!!?

Im very happy & content with life, love & where Im at. However .. there is this guy that I have met through work & I find myself going 'go go ga ga' over. Hes getting married, Im happily married & I find myself acting all sickly sweet around him, he can't do no wrong. How do I slap this out of myself. Logically I know better, but when hes around I act completely smitten! Help me out coz Im looking like an idiot! I need to put a stop to this puppy love! How have others go around such situations?!