I like the second choice. I like the idea of you moving out, going semi dark and working on yourself. But ONLY if you work on yourself. Go ahead back to the gym, lose the weight, make YOURSELF happy. Truly happy. This is not about making him THINK you are happy, it's about BEING happy yourself. Don't be alone, meet some people. Join a club, get out. Then, when he sees you for your lunch time meetings, he will see the inner glow you have from your true happiness.
I'm not saying it would be easy, it would be hard. But I think it is worth it. Plus, you won't have to have the heart break of thinking about where he is and when he is with her.
