Dude, do NOT shave that! Especially if you like being bearded that much! If it will make your wife happy, then by all means trim it back. A trend I've noticed is that women tend to not dislike beards in general, just when they get very large, and yours is getting to that point. Just trim it back and make it look very well defined. If you need to carve a cheekline for that to happen then by all means, do it. But DO NOT SHAVE IT OFF.