Open his mouth and see if there is any debris there. Lots of geckos have problems with spitting out dirt, pieces of bark, etc. Also, tear the legs off of the crickets and see if your gecko will go after them now- the crickets will still crawl, but not as fast, and there is definitely no hopping invovled. Also, you may want to separate your male and female. Females can be very territorial, and can deprive the male of food- believe me, chinese water dragons are notorious for that- and that may be why your male is not eating. If none of the above seems to work, go to PetsMart and buy something called JumpStart- it the reptile dept, and give that to your lizard. It can work wonders (high fat/protein gel that jumpstarts lizard appetite). Make sure your gecko has clean water every day, make sure his cage has is dry with a moist hiding spot. Humidity should be between 45-60%. Make sure the temperature is not too high.