Hey, if it doesn't work just remember there are tons of other boys who would love to eat a girl out. Or other girls who would love to eat a girl out. Most people quite enjoy it.
My 2 cents... Weather or not you are willing to be on the short side of the deal, is entirely up to you, BUT..... He should be willing to please you, in the same way you please him. Hell, he should be willing to please you, even if you don't go down on him. I honestly dont recall what I thought when I first went down on a woman. I dont remember if the smell or anything else "gave me pause". I do remember that I wanted more than anything else, to give her the sheer extacy she had just given me. I was even feeling guilty for not doing her first. I can tell you now tho, there is nothing else on this planet, that I would rather do. I go down on my wife 2 or 3 times a week, just for the sheer thrill of making her cum. Additionally, the fact that you go down on him without getting the favor returned is bad enough. The fact you let him cum in your mouth and swallow too, and STILL cant get any satisfaction is, in my mind, borderline criminal. Sounds like a "giver" stuck with a "taker". I started off by saying, only you can know if all the other nice things he may or may not do for you, is worth the neglect he's giving you. If you want my opinion.. If he isn't absolutely obssessed with licking you into orgasmic oblivion, then he doesn't deserve the generous gift you give to him with so much love and devotion.