Help please


I met this friend at my working place; we become good friends very quickly at first sight. From there since we have been doing things together like going home together, eat lunch together, sometimes we even go out just to relax to together. The thing is we become very close that every time we meet she will hug me tell me she has missed me, or sudden she will tell l me I love you when I have done something for her or comb her hair, calls me sweet heart , then smile. At first I felt uncomfortable when she keeps on hugging me every time, with time I accepted it , knowing that maybe she is likes hugging her friends. She then went to a level where she would kiss me on the lips when we hug each other every time we meet. When we sit together she would run her fingers on my back or hug me or gives me a kiss on the chick, or sometimes she leans very close to me until her breast touches my arm. Sometimes she would tell me that I love her and she knows I can not let anything happened to her, She also have a boy friend, they are planning to get married soon. And she keeps on telling me she loves him very much, and that she would do anything for him. She then left her job and got another job we still kept in touch Though she didn't call me much , am the only who kept on calling her very time just to say hi, or text her , as for her she will call me when she is coming to see me or in need of something. Recently when she started her new job she told me she doesn't how she will make it through the week without seeing me. The thing is I feel like she just with me for a ride, because sometimes she like behave like am forcing myself on her as a friend, because few days a go she pretend like I was not around, and give one of our a hug and assumed me as if I was not there, she did these for three days, when I pretended like nothing is happening she done started hugging me. Though sometimes I feel like she knows what she doing but , she just doesn't care. I have never had feelings strongly likes this for any of my girlfriends or any other girl it's only her though am straight. Help me am real seriously confused and it affecting me and my job. Even as I write I think we are not on good terms, I sent her a text message but she did not reply.

You don't say if you are female, but I assume you are, because you say 'best friends' and that you are straight. Just want to be clear.
Love comes in an almost infinite number of forms. It does get confusing when you miss someone of your own gender and you are straight, but it's normal. You like her, she is warm and affectionate, and now you are maybe wondering if she is bisexual, perhaps? And you don't know if she is avoiding you because you didn't respond enough, or if it's just because she's busy getting married soon, or something else?
The only answer to give you is to ask her.
If you are wondering about your gender preferences, just try to think of it this way: Some people are gay, some straight, some bi, and some are variations on all of them as time and attractions happen. And a lot of the time it has nothing to do with sex, just jealousy. I know a gay teenage boy who was devastated when he thought his best friend (a girl) was sleeping with his brother.