^ it is not a tumour.
crazy women are great. we men are pretty fucking weird too. humans are bizarre, complex creatures.
i can't say i have enough of a heteronormative lifestyle to play the gender role game though. your relationship may be really different to mine (my girl is neither 'boyish' or 'girlie-girl' and i'm not much of a 'man's man') but sometimes you just gotta accept things as they come. i wouldn't want it any other way, personally.
you love her? that's great.
she's insecure? needs reassurance? wants to talk a lot?
i'd say you need to work on your communication skills. not just you, but maybe you are not emotive enough for her to feel comfortable, so she tries to over compensate.