I have a partner who has agp tendancies. From what I've observed, when on a high the sexual obsession gets very intense, only to drop off quickly with extreme depression and denial/rejection of the previous sexual identity.
This cycle in my partner played out in a 3-4 year term. 1/2 years ramping up to his obsession. 2/3 years of intense sexual high, meaning the compulsion to dress and act like a "slutty lesbian". 3/4 years being repulsed by his risk taking and sexual disphoria. Rinse repeat.
It's a form of sexual bipolar. Now he is on serotonin (after a very bad bout of depression after going down the sexual TG lesbian route) and is stable he is happy, no AGP, no compulsion, none of the extreme anger. He also had a hobby that he took to extreme, bikes and cars, high speed and addrennoline, many near miss crashes.
EI, in my lived experience, mirrors this sexual bipolar. His obsession with marathon running in conjunction with the sexual pink lipstick lesbian personna. It's getting your kicks at an extreme level no matter how ill advised and harmful (and I would suggest Eddie doing the extreme running is harmful to his health and shouldn't be encouraged).
If Eddie ever reads this, PLEASE, get some proper help with your mental health. I mean it - the high that you are now experiencing will be replaced double by the crashing low that most definitely will follow. I've seen it and don't want anyone to go through that.
If anyone wants to read what it would be like to live with someone like Eddie, please listen to tinselangel and read the Trans Widows thread.
The upside is that EI is single. The downside is that EI is single so has no one to help him with reality.