You can never really love someone, until you love yourself. Living in your car is not really loving yourself too much. Be true to yourself, and concentrate on the bad things. Open your eyes, there have been plenty right before your eyes that you have let ride, because you love her. Man up, and get back in your house. Sleep on the couch if you have to. When she's there, be cordial, but not so loving. Give her some space, as if you weren't even there. If you know her schedule, be gone if that's what you have to do when she gets there. Don't beg her back, let her run wild. She'll either love the single life, or learn to miss what she had. Either way, you can't change her mind no matter what you do. If you are still somewhat around, she may realize that the space is not all she wants. But don't let her order you around!