You remind me that my marrige is almost 7 years old as well.
My wife is an endless book because she always shows me something new, nicely. But it's also because that book is not only for me to read, but for me to write as well. Aalthough she doesn't like most of what I try to write.
My wife is just like part of me. Interestingly, I had experience of getting bored of being me before, for a couple of years something. But by time, growing up, I found a new me and learned I can always change as I like. I haven't got bored with myself ever yet...until next time.