Aaaaargg. This is getting hard. So lets say I do move in. How do I make it known I have moved back? Hey guess what....
You move back in while she's gone, and when she comes back, she finds you there. She says, "WTF are you doing?", and you say, "I decided this is my home too, and I'm more comfortable here. Since I'm not the one wanting to end the marriage, there really wasn't any reason why I should be the one to leave." If she says "But I can't LIVE with you!" just say "I understand. If you want to leave, that's up to you, but you're certainly more than welcome to stay here."