I really really like my co-worker, should I tell her?

I am a teacher and so is she. She is a 3-6 grade teacher and I'm an art teacher. She is a new teacher and were are around the same age it's just that I'm a year older. I'm not stationed at her school but I do have to go there on Mondays, Thursdays, and Fridays. She is so beautiful, soulful, and passionate. Sometimes I stop by her class and listen to her lessons and I can see that she is so passionate and that is one of the things that makes me attracted to her. But, what really makes me attracted to her is her personality. Whenever I'm around her and I just feel so calm and relaxed. She inspires me to be a better person. We are friends and we do have a great friendship. We have hung out before and I try to disguise it as if we're just "Hanging out" but I treat it like it's a date. Sometimes when we are out of course she gets hit on and it does make me feel some type of way but you know, can't really do anything about that. I've never "made a move", but I have flirted with her (IN RESPECT) and I don't think she caught on, so it's hard to tell whether or not she feels the same way about me. However, there are many factors I have considered with her rejecting me. The main one is the fact that we are co-workers. I care for her so much and I do want to spend the rest of my life with her. Should I tell her how I feel?
I really really like my co-worker, should I tell her?
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