Well, i'm green so my opinion can be taken lightly I guess. But generally I tend to be a nice guy too (consider myself a little too nice actually). And being like this is, i think anyway, is what got me my now ex-girlfriend. We were together for four years until last week, and we split because she took advantage of my niceness. Enough about me, I think it's worth the "risk" that you could be hurt later on because if you hold back, and she really does like you, then you risk not having her forever. I wouldn't trade my last four years for anything in the world. About the love thing, I think it's ok that she let you know she loves you, it's being "in love" with someone that I think is questionable if it comes too soon. My vote, be yourself.

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The voices in my head tell me I'm not crazy.
"Take off your cool, I wanna see you." Andre 3000