Love relies on honesty. Love without honesty is like ice in an oven: Sooner or later, it will melt away.
I suppose this is the crux of your argument, yes? Aside from some rather strange deviations onto the subject of moral relativism, most of what you say can be boiled down to this pithy idea: that honesty is a necessary prerequisite for sincere and persisting love.
Do you believe that to be true? Maybe you think you do, but let's try and falsify it instead. That's the scientific way. What if I told you there are people in the world who believe in lies, people whose love, no matter how sincere, is misguided? What if some people lived their whole lives believing in things that are not true, loving their perception of something more than the something itself? Do you dispute that such people exist? I leave it to you to answer, but there is only one answer.
Your argument is impressively tall, but insufficiently deep. It will fall over...and all those tall towers will look rather silly lying on the ground.
I cannot believe that you and I are truly in disagreement. It simply must be some failure on my part to convey my idea effectively. Boil it all down, and the crux of
my position has been that, all else being equal, it is better to be loved than hated. You'll get further with people's support. It feeds on itself, even! How many times have you dismissed the beliefs of strangers, only to listen intently when someone you admire espouses that very same belief? Your friend benefits from your built-in respect by receiving a favorable hearing.
Most of the people who have disagreed with that--with me--have said either that love cannot exist without the object of the love being what the love-giver perceives it to be, or that it is too emotionally uncomfortable to maintain such a charade. But the former argument is a phoney, and the latter is irrelevant.
It isn't folly to admit the truth. The human condition is riddled with imperfections. Here is one of them. Even though honesty is the "best" policy, it is not always the most practical one. Playing people's ignorance by exploiting their love may sound like something Darth Vader would do, but in the end it's just a tactic...another move on the chessboard, toward achieving one's ultimate ambitions.