Can she be the one?

I am a guy that have always believe in
friendship between opposite sex without
having anything intimate between them. I
have a female friend back since our ND
days in the polytechnic. We were so close
that people never believed that there was
nothing actaully between us except the fact
that we both had our seperate relationship.
We both finished our HND & fortunately we
were posted to the same state for service &
after service year i was retained by the
company & she has been without job ever
since. I have been taking cere of her
financially ever since, a gesture she now
feels she's indepted to. A month ago she
came to my place & asked me to marry her, i
was speechless bcos i never saw it coming.
She told me of how she has always loved
me ever since we were in school but was
afraid to open up out of respect for my
girlfriend. She has been through a lot in the
hands of guys bcos as far as i can
remember, i am the only stable male friend
in her life in a long while now. I don't want
to cause her more grief bcos she just had
another round of breakup with her
boyfriend & I also have a girlfriend whom i
love very dearly. Pls house advice me on
what to do.

not about sex dear.can't you see the girl  is desperate huh..