Seems like you will be caught up in a vicious circle. Only been together for a year and he has already stopped trying to a degree. Another thing is that if he is using sex as an excuse, he is an incredibly selfish guy. Even if he admits it, you are going to have an uphill struggle if you think he is just going to change. People, well most people are creatures of habbit and to change that habbit requires a lot of self knowledge and effort to change things. If he is in fact as selfish as he admits and appears to be, this could be the beginning of the end. I find that at most times we already know the answers to the questions we ask, but we do not always want to believe the answers which we dont want to see.