One of the most unmistakable signs a girl likes you is her reaching out and planning to meet more often. It doesn't have to be about dates! She may ask you to tag along while running little errands, grabbing a quick bite, small hikes, and adventures, or even become her workout buddy.
Look at how she acts when she's around you—open body language, eye contact, and physical touch are signs that she could be interested. See what she says during a conversation; if she likes you, she might compliment you (or even tease you).
If she knows and does like you back she will talk to you more, walk near you, sit next to you, make eye contact, twirl her hair, or give you compliments. She may also be secretive about who she likes.
People tend to naturally lean toward people they like in conversation, according to Battle. If the guy you like tends to lean his face in closer to yours while he's talking to you or listening to you talk, that's a good sign that he might be into you.
You can try: "When we talk and spend time together, I feel like we have a great connection. I've been wanting to ask you if you have feelings for me, because I have feelings for you." You could also try saying something like, "I've liked you for a while now, and I was hoping you had feelings for me too. Do you?"
She may have good reasons for keeping a lid on her feelings for you. She's already in a relationship and isn't sure whom she wants to be with. She knows what she feels for you but doesn't want you to know just yet. She's ashamed of her feelings for you but can't help showing them sometimes.
Catching her staring at you is the biggest sign she has a crush. Look for other telltale cues like blushing, giggling, or making excuses to be together. Listen carefully to what she says—if she asks you about your crushes or talks about how she wants a boyfriend, she's dropping you some hints.
The reason why crushes feel so intense is that the person with the crush craves deep intimacy with their object. It's the kind of closeness that is difficult (but not impossible) to come by in friendship. Imagining that intimacy is euphoric. But with true intimacy, you get to see the best and worst in someone.