What does girl means by doing these actions?

Ok, i'm into this girl for quite sometimes. But she has a bf. We are working together at the same firm. I remember once i was in the gym, the gym is mainly for and no girls in the gym, She came find me two time in the saturday morning. She said wanna do some cardio. In office, She seldom mention her bf in front of me, but she told other colleagues. Sometimes when she was down tide, I always chat with her about things going. And she always forward the pics/ photos and songs that she likes to me. One time company trip, me her and another male collegue was sharing a room. And i was not sleeping good, she was too. Because i was sharing with another colleague on a sofa bed which was too tiny for both of us, on the last night she asked me went over and share the king's size bed with her. Occationally we had company dinner, sometimes when she sitting besides me, she always take some food for me. That day i was vomited and no appetite, she put some sour plums on my table before she left. And i kept telling myself she's in relationship. i really like this feeling so much.Tell me what should i do?