Well I'm not truelove ( and I can't sleep!) but I'll answer. I go to the gym 5 times a week. I've lost 15 kg. Lots more to go.
The only thing that has ever made me get up and go out is that I feel worse having not gone, than when I have gone. When I don't go I feel guilty. I try to avoid the guilt at all costs :-)
The worst part is getting out the door. The days when I REALLY don't feel like going I grumble all through putting on my gym clothes and shoes. I sit on the bed contemplating NOT going. Then I put something bouncy on my ipod, something that makes me want to sing and dance. Makes me bounce right out the door and I sing and bounce all the way to the gym. By the time I've filled my water bottle, I'm ready to go because everyone around me is running and lifting and sweating.
When I'm done I'm hot and sweaty and my muscles hurt and I feel like I worked hard. I know that I'm that much closer to my goal. If nothing else, I can then lie on my couch and watch a movie guilt-free haha
I won't lie, exercise does NOT make me feel happy, but seeing my clothes getting bigger and my scale numbers getting small, do.
Also I don't want to be that stupid horrible, tired, old mess. If I'm going to be single, I'm going to be a hot single. I have a long way to go but for me my motivation is not letting them (him) win.
They're not sitting in a pile, or lying on the couch eating crap, watching a rom-com wondering what-if and when-is-she-coming-back. If you have nothing else to make you get up, for now make it about them not winning

You just have to make yourself. No magic formula I'm afraid. I hate working out. But my muscles are so sore right now and I feel like I accomplished something today.
I've been thinking about starting a message board with exactly topics like these where we can motivate each other and not get in trouble for not doing the psychic stuff :-)
I need motivation too, even though the person who caused my psychic (and complete) meltdown is no longer an issue for me. I have my moments