Confused about this girl I like?

I met this one girl off of face-book, and she lives in vanderhoof and I live in maple ridge. We have just been talking over text and MSN and stuff like that. I have known her over a year now and we have never met. Yet stupidly I feel like I like her, like I like her like her. And I mean she knows I like her but she still says oh we should just be friends. And yet for some reason I cant only think of her as a friend, I keep on thinking I am like in love with her, which is stupid. Anyways recently she tells me that she has feelings for me back, and so I am ecstatic. The two of us start talking and I say I am gonna see her in the summer and stuff like that. Well just the other day she tells me her friend asked her to come along with her on a double date on valentines day. And when she told me about it I got very angry at her, did I have grounds to get angry at her? she has done this 3 times to me before where she tells me she likes me and then she ends up dating some guy and then I get pissed off. Do I have the right to get angry at her? I am just confused I mean if she likes me then why would she go out with someone else? I am sure being so far away does not help. But I mean I actually feel as though I really like this girl, but yet she just seems to get with these other guys who she ends up havin with before she even dates them. I just dont understand why I like this girl, and why just the thought of her with another guy makes me balistik when I have never met her. And she tells me she likes me and all that **** and she even said she loved me, but I mean then she is goin out with someone else, I just dont know. Should I just delete her from my life?