Thou Shalt (If Interested) Express Some Interest
Don't play hard to get if you like him. A man likes genuine compliments just as much as you do (maybe even more) so don't be afraid to tell him he's handsome, interesting or funny. Offering to cook a meal for him is an exceptional, appreciative gesture. If you are not a great cook, order food from your favorite take out service and top the evening off with a back massage. But do not offer to outright pay for something: once a woman touches money/credit card in front of a male she becomes masculine energy, which is undesirable. Once you are in a committed relationship, however, paying for things in his presence is perfectly acceptable.
Remember, when a man has set the precedent of being the masculine energy in the relationship, the utmost reward for him is love, affection and availability. But every now and then he too would like to receive a gift, home cooked meal, or back rub that shows that you truly care.