What would you do in this situation?

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Sorry in advance if this write-up is long I once had a female friend, we where extremely close that we became besties, along the line i started having feelings for her which i told her about it, at first she had doubts saying someone like me can't like someone like her, but along the line she said she liked me but for now wanted to focus on her school and growing business, i myself wasn't really ready for a relationship, i wanted to also focus on growing my business and financial life cause i believe going into a relationship means i have plans for marriage, so i didn't want to rush into it. We decided to take things slow, be friends get to understand one another, and when the time came, if the feelings was still there we can date. Along the line she said i was putting her under pressure cause i was being too nice, i had to make her under that it was simply my nature not cause i wanted something from her but simply because she is a good friend of mine. Over the year we had tons of fights and arguments, whenever i try to express myself or say the things i don't like, it often leads to arguments, to the point that i would rather not say how i feel than having to fight with her. She always replies late, i tried to be that understanding friend, i know she is busy with school and work, but it was painful cause where she left my message on red, she was constantly posting her business on her status. We had an argument about this. I understand the fact that it's easy to forget to reply someone, i have been there several times before, but it becomes an issue when it happens almost all the time. Fast-forward the story, last year she actually forgot my birthday, untill midnight when i posted about it, and i was very upset, but the funny thing was she never made any effort to pacify me, i didn't message her, thinking she would be the one to make the move, all these while, i have always been the one making the move, even when it's obvious she is the one at fault, i still drop my pride to apologize and all. I had message her again but she just brushed it off like it doesn't even make sense for me to be angry about it. I felt really hurt cause this one someone i helped built her business without asking for anything in return, constantly helped her with her school activities both during research, financially and all. She stopped taking to me all through last year from October to December. January this year, i made the first move to contact her again, i tried to reconcile, i put in effort, even when i know i was not at fault. We settled but i noticed she was constantly giving me one word replies, acting cold and so on, i got so tired cause it felt like i was forcing her. I stopped chatting with her till date, and till now she did not make any attempt to message me. I honestly don't mind being the one to make the first move, but at the end of the day, am also human, and it would be nice if someone put in as much effort than i do. Yes i know she cares, there are certain things she has for me that others haven't at one point in time, but i want someone that can also respect my feelings, and won't brush it off, or also put in effort to show that they want me in their life, not me being the only one. She tells me she cares but her actions makes me doubt. I don't hate her or anything. Her birthday is coming up july, now am conflicted, do i just ignore since we haven't been talking, or do i just simply wish her a happy birthday? I feel guilty like i did something wrong for giving up on the friendship, but on the other hand, i feel like i did enough. What's your take on this?