I had the same story with my ex husband. He was too lovey dovey and at some point i got so bored of it. Our relationship started sinking and ended up with divorce.
He was my high school sweetheart and i really did love him, but something about him as a man just stopped working for me.
I wish i would try and fix it and talk to him about it. But i was stupid and kept thinking it's his fault and that he is not a man enough. But it was really the opposite, he was a man who tried to make it work, maybe not in the best way but his intentions were the best. I was an idiot and i'm really regreting it now. I hope your wife will not make the same mistake. And i recommend you trying a different way of winning her love back. Because this way unfortunately only does the opposite :(