My partner is bored of being intimate with me

My partner and I have had an amazing relationship and connection for over two years. We're very committed to each other and are planning a very long life together. However, he recently was very open and honest that he isn't interested in having sex with me anymore. He says this has happened in every past relationships and has ended it as a result. He knows it's because it's the "same person" feeling, but how can he get over this?