I have a crush and a female friend and I'm a girl. Is this the right way to tell her I like her?

[extraordinary]

So before you read what I wrote,
i have a friend who i've been friends with for a year and i basically started REALLY liking her and i'm a GIRL too. there are a couple very subtle signs that make me believe she could possibly like me too but i'm not quite sure. Like for instance, she would often text me she misses me and one time she texted me "miss you <3" after I just saw her the day before. and on valentines day she texted me happy valentines day with a bunch of emoticons and then she took a screen shot of my text msg and uploaded it to her instagram that read "<3 she made my day. #loveofmylife." before she put anything up about her boyfriend. she also like took a picture of me once at school because she thought i looked really cute and also uploaded that to her instagram as well. she often says things to me like "you're cute." I even caught her staring at me once while we were at the bar getting drinks. from the corner of my eye i saw her looking at me so i turned and we made eye contact for a few seconds then i smirked and she smiled quickly and looked away. by the way she knows I'm bisexual.

so about the part where she has a boyfriend. she recently told me that they're not "together" but still talking. i feel like they've fallen out many times so i'm not sure how that's gonna go. but yesterday she texted me after she woke up about our summer plan to california and then she tweeted on her twitter "it's weird how fast things can change." not sure what that meant
HERE'S THE LETTER I WROTE

http://s17.postimg.org/u7jc00ucf/Screen_..._42_AM.png

[LadyMarissa]

That's a very sweet letter & IF you gave it to me, I'd feel honored (BTW...I'm bi)!!! However, since you don't know what it is she's feeling, I'd hold off giving it to her for now. Maybe drop a few subtle hints on how cute she is. I had a crush on my bff. She is so straight that she can't even sit down & I learned later on that it was a good thing I hesitated as she is so homophobic that my declaring my feelings for her would have totally freaked her out & I would have lost a dear friend!!! Good friends are rare & I don't think I'd give up that friendship over a crush!!! Just be cool about what it is you're feeling & WAIT!!! In time you may well meet another girl that you'll be crushing on; & who knows, you might even meet a guy that excites you!!! You're still young & the world is still open to you. There's NO need to rush into a relationship with her. Tease yourself with her because she is your forbidden fruit. In time, the 2 of you will work out any feelings that you might have for each other!!! The fact that she's flirting with you sounds somewhat promising & she "might" even be bi-curious!!! The fact that she has a bf tells me that she's NOT sure what it is she's feeling!!! Give her time to figure it all out on her own. IF she decides for sure that she is bi, I bet you will be the first person she tells & that's when you make your move!!! Just be patient for now & learn to control yourself. I know that you do NOT want to freak her out & run her off!!! My Mom always told me that "patience is a virtue" so be patient!!!