Talk about your crush.,
Talk about prom plans.,
Ask her who she’s interested in.,
Talk with your friends.,
Read your best friend’s social networking posts.,
Check whether your best friend is talking to your crush online.,
Try asking outright.,
Whenever your crush is around, look at your BFF and see if she is comfortable with your crush being there or if she is looking all plastic and hurt deep inside. Most girls are good actresses so you really have to take a closer look. Can she look straight in the eye at your crush? Can she still talk about normal things like your other friends do? Does she stay with you there when your other friends leave or does she make the first exit?;
, Talk about things that he’s gone through like competitions he’s joined or whatever. See if she knows those stuff and if the way she says it is a bit possessive. If she speaks too brightly then that would be a very bad sign. If she doesn’t speak at all or looks like she’s not interested in the topic, that might mean something as well. Each person is different and reacts differently so you have to know for yourself what each action means for your BFF.
, If you’re in High School then you might as well talk about prom sometime (just make sure the timing is perfect and not like your topic just came out of the blue. That would be suspicious.) Ask each of your friends who would they like to go to prom with and NEVER ask your BFF last (that would make things more obvious and suspicious). Maybe you could ask her first since she’s your best friend. If she says she’s not interested in any of the guys or if she decides to go with the last guy you could ever think of, then that means she is interested in someone.
, When you girls are alone doing a project or an assignment, you ask her who she’s interested in. If she says there’s none then probably she doesn’t like to hurt your feelings because she likes your crush. It’s impossible not to be interested in someone especially in High School.
, Talk about the things you like nowadays (books, musics…etc.,) If she is saying that she likes what your crush likes then that is a very bad sign. It clearly shows that she’s desperate to be noticed by your crush and not you. If she compliments about your crush a lot and you don’t want your crush to like your friend, then just keep cool. Don’t say bad things about your friend to your crush or else he’ll think that you’re a basic loser.
, If she or he is posting something on Instagram, Tumblr, Twitter, Google+, Pinterest or Facebook about your crush, or has uploaded/tagged/liked, etc., a picture of your crush, then it’s quite possible that your best friend likes your crush. This can be one of the things that go to make up the whole picture.
, If your crush is online on Skype or social media apps, see whether it’s possible for you to tell that they’re both online at the same time, while your best friend is ignoring your repeated pings to talk. This will tell you that your best friend isn’t busy but might well be talking to your crush.
, Simply say “Hey, do you like X?” If your best friend blushes, finds it hard to make eye contact with you, says something like “Phfff no!” or changes the subject, this might be the clincher.
If you ask your best friend via social media, it will be harder to know whether your friend is covering up or not. But she/he will still say no.
, When it becomes clear to you, tell your best friend that you’ve noticed that he or she has feelings for your crush.
If your best friend isn’t already aware that this person is also your crush, try to clarify that you also like this person and that you think you two need to work out together what happens next.
If your best friend does already know, this is a bit tougher because it’s something that has happened despite knowing your own interests. In this case, tread carefully but you’ll still need to sort out what happens next.
See How to deal with your best friend dating your crush for more help.