Does a woman sense when a man refrains himself from showing interest in her?

I am single now and I am very attracted to a co-worker. Because she is my co-worker and she has been in a relationship for so many years, I try to refrain myself from showing interest, not only because I don't wanna disrespect her, but I also want to protect myself from being too obsessed with her. During breaks I feel like talking to her all the time, but I am trying too keep a certain distance. I had lunch with her once before I knew for sure that she was in a relationship, but I have not invited her ever since. Do you think my body language betrays my feelings?

Does a woman sense when a man refrains himself from showing interest in her?
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