My wife has two, actually, and no, I never get tired of ogling either of them. But then, I have a pubescent boy's fascination with the female body and I'm a sucker for a nice set of squachies.
Not all men are wired the same, though. I once worked with a guy who'd been married about three years, as had I at the time. One day he told me that even though his wife had a "kick-ass body," he'd already become bored with it. Said he, "She could walk around the house 'butt-naked' all day long and I wouldn't even notice." Really? Que está loco, amigo! So I told him to send her naked ass over to my house, because I'd definitely notice. He didn't care much for that idea. Oh well, just trying to help, chief. No thanks necessary.
But enough about me (even though you asked me about me, because I know you're really asking me about you and your husband, which is fine -- that's why I'm here). The simple answer is this: everyone's different. Some people by nature get bored easily and start looking for the next new thing, while others learn to appreciate and savor what they have. Some of that patience comes with age and experience and learning that the grass is nowhere near as green as it looks from this side of the fence, but that's no guarantee, either, when you think about the scads of older men who trade in their wives for younger hotties.
I think the biggest factor in enduring attraction is the strength of your relationship on an emotional level. Attraction begins in the mind, and it is driven by things like trust and mutual respect and an authentic fondness for one another. I'm still attracted to my wife's naked body because I know that she loves me, she likes me (two different things), she's still attracted to my fat ass, and she makes me happy. I love her for who she is, so I'm naturally attracted to her physical appearance. The attraction is the by-product of a strong emotional relationship. It's almost impossible to be turned on by someone we dislike.
Most happily married men still love seeing their wives naked and -- as the kids like to say -- tappin' that ass. If you and your husband have a good emotional relationship, I have no doubt that he still has the hots for you and that same ol' breast (either of them).