There's a difference between investment and interest. It's fine to be interested, it's not fine to be invested where there is no reason to be.
If a woman smiles at you and you start planning your life together, that's being too invested.
If you smile back and flirt lightly, that's interest.
Quote:
its inevitable that you have some kind of investment.
That may be true, you will have
some investment. But it needs to be appropriate to context. The above example is not.
Quote:
"well i've noticed x, y, and z about you. do you feel this way about a, b and c"... that's showing investment... it's showing that she's crossed your mind a little bit.. but how else are you going to have a conversation, without taking an interest in people?
That's arguably showing interest, not investment.
Investment is saying "So I've been looking at your facebook and in 2015 you liked that sushi place downtown. You go there often?"
Too much, too soon.
And no, don't "plan". Flirting doesn't need to be planned, it's improvised.