Why can't I seem to win his/her affection even though I do everything he/she likes?

You sometimes just can't "win" someone, no matter how hard you try, and the sooner you realize that, the better for you. Instead of wasting all your energy on one person who doesn't care, try to find someone, who'll truly appreciate your efforts!

Sometimes, when giving someone what they like, they realise that they may not like it anymore. It's sort of like... Obsessing over a movie star for ages, finding out what their favourite colour is, what they like eating, what the enjoy doing, and matching yourself with all those things, that can be seen as their criteria. Then when you finally, after many heart-aching years, get to meet them, they don't seem interested in you, or you may not be interested in them anymore! Whyever not, you think. You've "loved" them for this long! Pined for them, fallen asleep looking at a life-sized poster of them. "Why does it have to be this way?", you ask yourself. Sometimes the things that a person likes, just aren't the things they would like in a partner. Sometimes they just like those things, and would respect another for like them too, but the "criteria" you set up in your mind, isn't THEIR criteria. Other times, the person just might not be interested in relationships at that time or may be interested in someone else! But it's alright! You can always win their love another time, try to enjoy the life you have in front of you. Perhaps there may be someone trying to win YOUR affection :) And this seems terribly cliched, but be yourself! Be comfortable with who you are! Do the things that you like! Love will come!

Affection os earned through mutual trust ... we don't force feelings it comes naturally so keep being honest and trustworthy who knows you might win the person you love.

It takes time for someone to become fond of you. If that's not it, then maybe he/she just doesn't look at you that way, but it's okay! Not everyone will like you and you won't like everyone. If this person cannot realize that you are a fabulous person, then they are not worth your time. You deserve to be with a person that truly loves you.

Sometimes things just don’t click, and it very much sucks to be in that position. I’ve certainly been there and it isn’t much fun. Sometimes backing off and not trying so hard can help but if it doesn’t just remember that you don’t want to be with someone who doesn’t return your affection. You deserve to be with someone who makes you feel loved for who you are. Best of luck!

Maybe its because she/he hasn't notice you yet... maybe that person only looks up to you as a friend... Or maybe they had unpleasant past experiences which made them feel reluctant to accept a new person :D

Sometimes people just are not meant to be together romantically. That does not mean you can not have another type of relationship with them. Or, in some cases it may be best, and also easier, to openly express your feelings and emotions to said person. Of course that is ONLY if you feel that is what you want or need to do. The main thing would be to stay positive!

Because you're doing it just for your ego. You want her to appreciate you because you're DOING what she likes. Are you doing her a favor or something? If you want someone's affection, you should look past their outward appearances and start seeing them for what they are. Why do they like these things? What makes them feel like it's special?

Maybe you should confront them and tell them how you really feel, tell them in detail how hard you have tried. They may not be able to tell when someone likes them, point it out to them, maybe they feel the same.

Winning someone's affection is not a game. Even if you are in synchrony with regards many of your interests with another person, that doesn't equate to instant affection. You need to build rapport with people, be kind to them, try to talk to them and actually listen to them. Having a conversation is sometimes the best way to figure out if both of your are on the same page in life and also increases amicability. In many scenarios, it might not lead to anything substantial, but you always end off better for initiating those positive encounters. There is no equation for building a relationship. Both people need to have the end goal of affection in mind, otherwise you can end up alienating the person and making them feel uncomfortable.