Sounds like a classic case. *Rub chin*
***
Lesbian? 
You might have discover... not entirely.
I do not know you; therefore I keep my own assumption.
I have my own fair share of lesbian friends. And
me being such a good jie
mei (bleah), we end up being pretty good friends. As we
spoke and I got to know them better, there could be thousand and
one reasons why their free-will chose this path. However one trait
never run away.
Astrologically speaking, whenever I scan a birth-chart check, the
lesbian tendency is often demonstrated by a kind of love-deficiency
shown by affliction in relationship/love-related areas of their
life. In my studies, almost certain, such relationship have deep
karmic roots hidden and to pursue them usually spell the
same-effect as most other heavily afflicted relationship -
unfulfilling, short-lived or worst, terrible emotional scars.
Although, a gay relationship is normal (A super long theory
involving mascline and feminine energies), however, it's karmic by
nature. Past cruelty in love brought about this present
reflection: everything that happens on earth is part of
nature and is in fact, normal. (Of course, not everyone would agree
with me, especially if you are religious by personality. New-age
idealogy are so often deemed as unorthodox)
You are confused because the idea of loving a man
is a complete new realm to you. This confusion is a battle of the
soul and the body - you are a biologically-born female and your
physical gender automatically attracts a biologically-born male.
Your soul could be somewhat opposite of this flow, thus the lesbian
tendency. However, the man you fell for is a mixture of what heng
said 'feminine yet gentlemanly...' and because he exude energies of
both yin and yang, this magnetic attraction fits your special
lock.
You may have been with your steady for years, but ultimately if
that what you are looking for? A companion-ship? There may be
'deeper' feelings involved, but eventually you can only revolve
around this keyword. Economics speaks about
price-ceiling - there is a ceiling to how far you could grow in
this relationship.
He is attached currently and now the mixed feelings. So how? What
to do?
Have you ever wondered... if you realise that his appearence could
be a message/hint for you to attempt a BGR (namely boy-girl
relationship)? You may or may not end up with him in a BGR, but if
a man like him, could make a lesbian like you, fall in love - your
previous lifestyle, mindset and attachment could probably evolve
from this day onwards.
Allow me to enlighten you: you will likely to be hurt from trying
out a BGR. But do not feel the pinch, retreat and give up trying
for one. Alot of lesbians tried out a BGR, felt the cut, lost the
relationship and ended back where they stopped and carried on
previously.
It's silly.
When you are ready to love, Love will give you that
chance.
You probably need sometime to research upon yourself. To see if you
really fell in love with him or if your heart has a void and he
merely fits in nicely.
P.S: Are you a Cancer, Scorpio or Pisces? 
Cheers
