First you need to relax, and be yourself. If he is with you, it's because he finds you attractive. If he really wants to get to know you, then he will open up as you do. And, eating is a natural part of life, if he cares about you, he wont care how you eat, as long as you remember your manners, and don't chew with your mouth open, or talk with your mouth full. And, guys like a girl with hearty appetites, as long as they are not being a glutton. All relationships are work, you have to decide if the work is worth it. If all he is after is sex cut him loose, he only cares about himself. You'll know that if every time you turn around, he turns the conversation or alone time to sex. If he expects sex because he has spent time and money on you, then again all he cares about is himself.