Crush on Co-Worker?

I have a crush on a co-worker who is already seeing someone else. I’m friends with her, but haven’t told her my intentions. But, I have shown my intentions indirectly in these ways: (1) we are consultants & tend to work in a team (although she works in a different team) & lunches with the team, however, she & I go to lunch alone & mostly outside of our work area (e.g. outside of downtown). (2) Our lunches are at expensive places. (3) I often compliment her on beauty and smarts. (3)We work out together at lunch or after work. (4)I don’t think her BF is aware of our lunches. My question is if she’s aware of my crush on her & is being pive or she only sees me as a friend. I think given the context in which we relate (work and otherwise) there’s really no reason for us to be friends, so she must know I like her beyond platonic level, but I could be wrong, as she’s very pive and I tend to suggest and encourage the things we do. I know she has a boyfriend, pls no moral replies