If you're still living with the person, it's harder.
Every energy you build for yourself is sucked away by them. Even when you give the slightest hint, there's something more interesting than they are out there (doesn't have to be a guy) they start their stuff again.
If you're living separately, it's better. You're more able to block them out and move in baby steps to a better way of living.
Either way, there's really only one way out to get a life worth living back together. That's, find the beauty in life and in youself, something usually they could care less if you ever found at all and are even threatened by your finding it. It would give you empowerment and people would be naturally attracted to you, intrigued.
When you induce that, you've instigated for them competition.
You got to get the anger out, I suggest a punching pag. And then you need to get up early, just for you. Get a cup of coffee, some herbal supplements or vitamins (I like St. Johns Wart), a favorite chair and watch the sun come up before heading into work and yet giving even more to someone that isn't you. If you can manage a sunset, all the better.
You start taking care of you, because nobody else has and rewrite that canvas of yours
