yes OP you are right, proof of ongoing relationship is not asked, the only requirement is you two have met in the last 2 years. i do think that some is overdoing this and sent in 200 pages of skype or facebook chat etc.....you can have something ready when you have your interview if you like. i only sent in a few pictures and 2 boarding passes that we travelled together, no emails, no chat logs etc did not get a RFE nor did they ask for anything at any stage of the process.
good luck
when I had my done, i just apply for one on internet and it was posted to my address which i included in my documents when sending the packet 3 and it was accepted.
however i do not know whether anything has changed since nov 2013
patem got a reaction from David & Diana R in I don't see where "proof of ongoing relationship" is required
patem got a reaction from sweetswinks in K1 visa police certificates answer from US Consulate