I (30m) am truly in love with my roommate/best friend (25f)

so ive got to get this off my chest... my best friend (lets call her K) i've been living with her for 2 years and have known her for about 7 years now, we have been close for about 4 years and i am deeply in love with her, she is the most amazing person i've ever met. we always laugh together, do activities together, do things for each other all the time, have very similar interests and enjoy spending time together. But i have been stuck in the friend zone and it is affecting my mental health in a big way and i suffer from depression and anxiety....

K currently has a boyfriend but is on and off with him and i dislike him (so many red flags) and i think she knows i don't like him and rarely brings him up and i appreciate that she does that. We are very close and extremely open with each other all the time. she knows everything about me and i know everything about her. she knows i love her and i've told her many times and we both say "i love you" to each other but i don't know if she means it in the same way i do. i have nothing but good things to say about her, she is my world and i would do anything for her and i try too all the time. She recently (3 weeks ago) rolled her ankle running and tore a tendon in her foot, so needless to say she has been hobbling around with crutches so i've been doing so many things for her like putting her ice pack on, getting her comfortable, getting stuff for her and all of this she doesn't ask for since she is very independent and always on the go but i do it out of the kindness of my own heart and i know she appreciates it a lot.

k and i have talked about getting together and wonder why we haven't after all these years, my parents know her well, and all of my friends do too and we share many of the same friends, almost all of them say things like, "i don't know why you and K haven't gotten together yet", "you need a girl like K", and "you and K would be such a power couple together".

I've read that you only love 3 people in your lifetime, your parents are the 1st, your 1st love, and the one you marry, well to be honest i've never thought about marriage or kids with anyone and well she is the only girl i've ever thought about marrying and start a family with and i want to spend the rest of my life with her, i don't know what the future holds and don't want to do anything ever to jeopardize what we have.