I don't know the truth of what happened either, but only 2 days after he applied for a residency two girls he slept with went to the police to try to "contact him to get him to get tested for STDs" and this turned into "rape and molestation" charges claiming his condom fell off and he didn't stop having sex with them. I can not tell if a condom falls off either unless I look, and I generally don't have sex with the light on. I'm not sure if I'm weird or not, but the investigation was closed.
This is months after some of the biggest wikileaks releases including "collateral murder" and heading into the release of the Iraq War Logs and State Department Cables. https://en.wikipedia.org/wiki/List_of_material_published_by_...
Then a couple months later, based on no additional information, they reopened the investigation. He ended up going into the Ecuadorian Embassy soon after the release of "Global Intelligence Files" because the USA and private intelligence agencies were after him.
None of this has anything to do with the rape charges though. He is being sent to the USA over the 2010 Manning releases because he was communicating with Manning while she was stealing the docs. If she wasn't such an attention whore, she wouldn't have even been arrested. She bragged about it on IRC...