Superman himself, single or hooked up with WW, will always be a thorn in the side of Lex and many other people. Keeping him away from her will never change that. Some will revere and some will fear.
I think I'd like to wait and see what Grant does in Action and see if Superman actually died and if that as well as the Martian Manhunter incident did not contribute to making that five years difficult. It's clear it caused trust issues.
Once again people nit picking about a five year time line. Well again let me ask why did Clark not open up to his best friend Lois? I don't get it. Does he think her helpless? Incapable of coping with the truth? Could he not trust her? To me that secret is worse. Because Diana was his colleague but with Steve. She was most likely off limits and if you know a colleague is seeing someone else you'd try and respect that and not get too close. We don't even know when Diana left and went to London for that matter.
I expect there will be backstories to try to fill some of that stuff but still doesn't make sense to me why you think they need to broadcast it to the world. It is no one's business and they know what the media does. See what happened to Steve. Nothing they are doing is any different to two people who happen to be heroes and want to keep their personal lives their own.
It's their perogative to do that until they feel they want to share it with people they can trust not to blab to the media or use their story or judge them. While Lois does not know Clark is Superman, it is not her business really. Batman does not tell Clark what he gets up to with Catwoman I bet. Not that kind of relationship.