Recently there's been a couple times where I've been talking to the girl i like (i think she might like me too), usually in a room of more than 2 people. I noticed on 2 separate occasions that another girl in the room would be randomly smiling as we spoke to eachother. We werent making jokes or saying anything that would make one smile or laugh. Are they smiling because they know we like eachother? or some other reason?