oral's fairly normal so your bf's not out of line asking for it; it's the way he's doing it - demanding with menaces - that's all wrong. I can't say if it's 'better than sex' but I think couples use it as one item on a menu rather than a staple diet. My guess is though that even if you split up, you'd find many other guys making the same request, though perhaps not so rudely. Some women like it because it's less invasive than ordinary sex and they don't have to fake orgasms. But it doesn't bring them any pleasure, except that they're giving pleasure to someone they love, and how's that going to happen when you're doing it udner threat? So stick to your guns, don't do things you don't want to, and if necessary find yourself someone who prefers the same sort of activity as you do.
Does he ever offer to return the oral, btw?