Long distance relationship what should i do?

I love her so much and she keep ignoring me!
Back to that time i was living in united state where i was a student, then came a day where i meet her in a bar she was a bartender, at first i wasn't really attract by her she seems normal to me, then we start to talk n i found her a bit mysterious so at the end of that day i found out that we was just living in the same residence same place, she asked me to come over but since i don't know her i refused the invitation. After couple of days i didn't saw her again (cause some person didn't want me to see her) but then suddenly one day i was going to sleep n i heard a voice that i was familiar with (in the balcony next to mine) it was her voice she was crying to one of our friend saying to him those words (i know she know that i like her and i know she's having the same feeling for me). Obviously i was disturbed i wanted only one thing is to be with her that time cause in all my life no one cried for me. So i couldn't go n see her cause i wasn't sure of the number of the apartment but what i did is i called one of our (i hate him but is ok) one of our friend to ask him her number the day after. So one-day n it was a Sunday i took my phone n called her, she looked happy cause i called her n wanted to see her. so she came to pick me up with her friend to Pittsburgh where she was staying at that time n of course i was happy to see her again. So we spend a great day, i tried to understand the reason of why she was crying but she ignored the whole thing n told me that i was dreaming lol right so i skipped the conversation since she didn't want to admit n continue to chill get to know each other more… n then came the moment of my life ☺ the moment that i would never imagine or excpect, she asked me if i could stay waiting for her to come back after n hour n of course i said yes so she went to the kitchen taking her stuff n stand next to the table staring at me.. so i get close to her n kissed her n in one word she took my breath away it was the most n best kiss i ever had in my life she was really special her too didn't expect me to kiss her that way... so she went after that to her work for n hour n never come back she left me with her friend n never came back cause she lied to me she was with her boyfriend who was pist off from what happen between us. so i went back home n didn't want to see her again but after that kiss my emotion was uncontrollable. so i saw her again two or three other time with her boyfriend this time until came the day where she send me a message sorry girl but i have to change town for money. i was really upset, crying everywhere, almost destroyed. so what i said to her and since i wasn't from her country i text her im going back to my country then. n after three days i took my stuff n get back home without thinking. After couple of month i was lying on my bed trying to sleep n start to thing of her n suddenly n emotion ran all over my body i was really surprised so i text her directly saying that i was thinking of her n she respond the same thing but i was far from her so couldn't do anything. Days passes, where sometimes we was talking, months, a year still talking to each other (one fight) but specially me really in love with her but after 2year n this one the third year she stopped talking to me suddenly, she blocked me on Facebook and all the other social network n she start to ignore all my text message… i was trying to understand maybe because i haven't visit her for years maybe because i said something wrong maybe because it cost her to text me maybe because of her boyfriend knowing that now she’s not with him anymore maybe and maybe... i have tried everything without answer until now. So the reason im writing my story here today is to maybe get some advises suggestion anything to help me go through this and maybe who know get her back.. So what do you think i should do?