Should I pursue her even if she is taken?

We have known each other for a year now. We are colleagues. Recently I noticed she is really into me. She asks personal questions, she does all the typical things women do when they feel attracted to someone, like always wanting to be close with me, laughing at my jokes, typical body language (tilting head, playing with hair...), she even chases me. Then she catches up with me and starts conversation and is alway enthusiastic. But she has a boyfriend. I'm not saying she will be leaving him, but she definitely is attracted to me and I'm to her. Should I let it go or should I pursue her? I'm also older than her, 12 years older to be precise. I really like her, not yet in love, but it wouldn't take much...
Should I pursue her even if she is taken?
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