There's so much assumption and so much interpretation going on here, most of it based on very little. Ok, he was drunk. OK, what he said was odd, and if it was sexual, it was "deniable." But a simple, "What did you have in mind," or "What do you mean," might have clarified the whole situation. And, if he's such a good friend, you might have tried talking to him when he was sober: e.g."What you said to me last night made me extremely uncomfortable. I don't know whether you meant it in a sexual way or not, but in no way do I keep secrets from my FH. Don't even think about it!" bungee jujmping? Erm, nooo, don't think so.
There's nothing wrong with being direct, instead of wondering, worrying, discussing, e-mailing, interpreting, and still not really knowing the facts. email@example.com