What if there is this tiny chance that she just likes you for who you are? why ? because she is a woman you are a man and you are genetically programmed to like each other. By playing hard to get and using PU tactics you are rejecting yourself out from the beginning.

2nd how much effort do you put on winning the lottery? not much right ?
Now lets say you won the lottery but you did a mistake giving your bank account number and the money was transferred to another account, how would you feel? how much effort would you put in get that money back ?

it is the same... tell her that you are completely in to her... and if she acts bitchy, test you or does something that you do not like, be willing to walk away and say "I was wrong I'm only in to you if you treat me nice." Now she has a loss, now she has a reason to get you back... not before.

OP constantly tried to kiss close this girl. They have no relationship yet. They are not dating. They had no sex nothing. Why the hell should he tell how he feels. Thing is. He shouldn't even feel the way he does. I'm not criticizing because it's completely normal and we've all been there, but it's just suicide.
The girl was acting hard to get. Why should he reward this buy telling her his feelings.
OP please don't listen to this suggestion because in your case it won't work.

Thanks for the replies all of you.
Ive decided to go with not telling her anything, and keeping my cards closed for now.
But its quite hard not to get emotional with her.
Yesterday I tried the sex-texting thing.
Went like this:
Me "are you alone?"
HB "no, at a bar with a friend. Just drop by if u want"
Me "thanks, but working early tomorrow. Have a good one."
HB "are u allright?"
Didnt answer, she calls.
HB "whats up, is everything allright??"
Me "No! (pause) Im loosing in solitate!"
She laughs, calls me silly and we talk for a bit and hang up.
After that she text me this:
"So typical of you making me all nervous! Lol. Great to hear you are having a good time at home "
Didnt answer, and went to sleep.

Im so fucking confused about her.
Its like, she gets emotional so fast when I contact her, and giving me alot of IoIs -
On the other hand she never contacts me, and reject my kisses.
Does she like that im chasing her?
What can i do now?
Its so tempting just to tell her how I feel (but ofcourse I wont) because it feels like the next step to progress our relationship to each other.

Pretend she does not exist.

Go do something/someone else.

SHE is not the ONLY fucking girl on planet Earth! GET HER OUT OF YOUR HEAD! GFTOW.

_________________
They call me the cat whisperer, cause I know exactly what the pussy needs.

I went through the same thing, do not let your stronger emotions show through at all as soon as you do you instantly put her in a power position and you're going to end up getting fucked (or not probably) just keep escalating when you can and when she rejects you do what you can to show her you don't need her. If she is already canceling plans on you and you have been doing this little game for a year now it sounds to me you're more like her "just in case boy". You should damn sure do what you can to show that you are displeased with her when she bails on you , not that you're sad but rather disappointed in her lack of character.