TD, I'm all for white lies for the weak (the very old, the sick, the severely traumatized, the very poor, the fate-stricken) as in your case. I'm in the same boat with my father - I haven't told him that I'm the head of an Asperger's organization's local branch. But in the case of otherwise strong people, having to conceal a huge part of who I am from them because they'll be too weak to deal with reality - frankly, it makes me want to puke rather than love them.
Is it maturity or is it cowardice to be able to live a love where you're not loved for who you really are? Is it commendable to be able to enjoy such a love, or is it pathetic? I don't know. I only know I envy those able to relate in such a fake way without feeling frustrated and ultimately having a meltdown, as it happens to me. I can set out with really "noble" goals of helping them delude themselves about me, and not being able to be myself around them in such a huge part of who I am builds inside me as frustration, then anger, then I end up seething inside and ultimately I take it out on them.
However, on this thread I'm the ONLY ONE who finds it hard to do. The rest are only concerned with whether it's morally right, a good idea, etc. - but not with the issue of whether they're able to do it at all without blowing up.
I envy. 
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So-called white lies are like fake jewelry. Adorn yourself with them if you must, but expect to look cheap to a connoisseur.