You think about them often
You look forward to seeing or hearing from them
You feel nervous or excited around them
You notice small details about them
You want their attention or approval
You find excuses to talk to them
You feel happy when they message or mention you
You imagine spending time with them
You care more about how you look around them
You get jealous when they like someone else
You replay your interactions with them in your head
You feel butterflies or a racing heart around them
You want to know more about their life
You smile when you think about them
You feel disappointed when they are unavailable