No ploys. First, it's not what you really want, so why do it? Second, be true to yourself. Become a better person, yes, but don't become someone you are not just for her. There may come a time when you just can't take anymore of this. Sometimes being together in the same house is just too much. Although it may be too soon, it may actually be preferable for you to be the one that suggests she leaves rather than she be the one that either suggests you leave or that leaves you. But that's down the road. Just try giving her space in the house, even if you need to vacate it a couple nights a week.
In the end, it's not the years in your life that count. It's the life in your years. Abraham Lincoln
It is hard to fail, but it is worse never to have tried to succeed. Theodore Roosevelt