First thing you should do is know that everything happens for a reason. Also know that there are so so many other guys out there and if this doesn't work out, you WILL find someone...just be patient. Those are the key things you must burn into your brain. No one ever easily believes those things because that's just human nature. But you got to try - because that way, you have more confidence, appear less desparate, and if things don't work out, you aren't as heart broken.
Now, there is never any solid advice that works 100% for all girls to catch a guy simply because every guy is different. But from what I've found, most guys don't think into things as much as girls do. Hints that you drop that you're sure are a dead give away might not appear to even be a hint at all to the boy...they just don't read into things as deeply. Try to be a bit more blunt with your hints.
You got to flirt with him a bit. Don't be heavy on it though because if he's interested in another girl, you might scare him away. You can't assume he's interested in you right now simply because he has his eyes on someone else. Right now you have to work on making him want you. You need to show him what you've got that they other doesn't. This means, enhance your personality. Show a sense of humor (most all guys love a sense of humor in girls). Laugh at what he says but not too much.
Always smile!! Smiling makes you look more attractive and gives you a positive appearance. Not many guys go for girls who are...well...Eeyores lol.
You know what also works? Look him straight in the eyes. I know you've probably heard that a thousand times but it really works. Have you ever realized that once you look someone directly in the eyes you catch yourself thinking about it? Even subconsciously...eye contact almost always causes both people to feel something. DO NOT stare at him tho...that's just creepy lol.
In short, be positive, have a strong personality, a sense of humor, make eye contact, and show him what you've got that she doesn't. Flirt but don't go overboard. If you do all this and he begins to show interest in you, flirt more. Then, if things work out, YAY! If not, he's not the one for you and you are available to find someone better.
Another piece of advice, try not to get too upset over him. I know telling you that is nothing because you will anyway. It's just something girls do lol. It's really really tough being interested in someone who doesn't feel the same way, but you can't let that bother you because life is too short. You will find yourself in this situation a bit, unfortunately, so you really have to just understand the first things I told you and know that someday you will have the person for you. Life will give him to you. You just have to be patient and be strong
