...somewhere that Orthodox aren't supposed to pray with non-Orthodox? I would love to pray with my fiance someday...but I'm Protestant, and he's Orthodox. Is that really inappropriate? 

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I was told by my SF to attend my wife's liberal* Lutheran church at least once a month with her. I was expected to be polite; to stand when the congregation stood, to sit when they sit, but to not pray their prayers, not to sing their hymns, and of course, not to approach their alter or partake of their communion. I never made a big deal of it, I would just quietly get out of peoples way, the same way I do when I have not prepared properly for Communion at my own Church.Just to draw this out a little in a way that I hope will be useful to the OP as well as myself- where is the line between holding to the truth of Orthodoxy and respect for others when invited to visit loved ones' churches?
I was told by my SF to attend my wife's liberal* Lutheran church at least once a month with her.
I won't be converting any time soon - at least, not so as I can foresee. I wouldn't convert for him. It would seem like a lie to the church(es involved,) and to God, and to myself, and to him. I would also likely be far more wary of any urge to convert, simply because I wouldn't want to convert for less than satisfactory reasons.
That's good. Converting because you're absolutely convinced that it's the right thing is the only good reason to do so. Anything else, as you said, would be dishonest.