It's been some months now since i had to work with my old brother + living in his house along his gf

i started geting feelings for her after 2 months and even admited that to her
she said to me it's normal and that everyone already passed trough it
we have been like brother and sister a little before that, she said she likes me and that if we met once we would be a couple too

i asked if she also had deep feelings for me once too
she replied to me that she can't answer that cause it's not good for me or my old brother relationship
also said "lets focus on keeping our relationship ok? i don't want to see you depressed and i really like you"

Still felt envy of living with this couple once, and had devastating feelings too cause im living in same house with them after all
i had ups and downs cause im kinda dependent on her and often require 10 minutes each day of her atention only while holding hands
even though its an intimidating thing for brother/sister only it never did go further than that ofc cause i have a strong loyalty with my old brother.

Can tell a lot happened and will be easier to relate more to it when anyone starts giving me advice
all i can say is that i felt so much deep intense feelings that i even started to explore about anything regarding this, even my horoscope sign...