is it fair or unfair!

Is it fair or not fair?
You’ve been having a serious relationship for a few years, you are happy but you are not in love. She loves you and you like her. She is very nice and you appreciate it, she is cute and you like that. And lately you have been thinking of going to the next step in your relationship, because you think tat it’s a time, eventhough you are not in love with her, but because she loves you and she is giving you a good company and she is always there for you and you are spending most of your time together, so why not getting engaged and then marry her to make her happier.
But meanwhile you decide to take a vacation to your homeland to see your family and old friends. You say bye to her and she cries and says that she will miss you and you tell her that you will miss her too, and it is just a month of separation and it will be passed bye so fast.
At that point you are so honest and you are telling the truth. You really want to see your family and old friends and you really need a vacation alone to relax and rest a little bit among them.
You go to your homeland and you see your family and old friends, you are happy.
You talk to your girl over the phone every day, either she calls you or you do so, your family knows her and they respect her, because the matter of time has shown that she loves you and she is a very nice girl.
While you are back there, she is missing you everyday, she tries to do something special for you, a surprise , to make you exited and reveals how much she cares about you
So she tries so hard,uses all her talent and redecorate your apartment ,she starts painting the walls.she's done a great job, so when someone looks at the walls , can feel the love, which is behind it.
She counts the days to get close to the date you are coming back.
back there you are having fun with your family and friends, you go out every night and hang out with your pals and you are happy.
Girls are attracted to you, because you are handsome and fun. you also flirt a little with them, as it is in your nature, you used to be a great player, but you have cut it down for your girl in order she doesn't get hurt,and everything is ok.
All of a sudden one of these nights, you go to a coffee shop meet your brother’s girlfriend and she comes with a friend, you go close to acknowledge them and say hi, you look at her and you fall in love, yes that simple .
After all these years being here and all over the world and after spending years with your girl whom loves you and you felt liking her, and after all these years persuading yourself that there is no such a thing like love and getting ready to go in to a bigger commitment in your relationship, just 10 days before coming back here, in the most ordinary place, you've met the most extraordinary girl of your life, and you've fallen in love.
You are deeply in love and confused how this happened .you feel joy, you are up in the sky of happiness and she is as well, she is in love with you too and she is amused with this blink of high emotion, she as well is in there to see her family, she as well lives in a foreign land, and she has just come here to relax and spend time for a month in the homeland, but she has to go in 2 days, she is happy and she is sad, you are happy and you are sad, she goes to the airport to leave , she says bye you say bye, she pounds she comes back, and she says : I’ll stay till the end of your time, and we will leave our home land at the same time, even 7 more days is better than no more days. You spend all your time together, both families are surprised and worried at the same time, first they don’t believe there is a real love, and they think it is just a desire and a simple sexual attraction, but no it is not so. They are so confused.
You are so in love that you forget about your girl in here, you don’t call her anymore, you are in no doubt that your life is with your real new love.
now it is time to go back ,you both cry , you promise each other that you will get back together soon, she tells you where ever you are she wants to be there ,and you are admiring her with your eyes and with your heart.
You are back in here , at the airport it is her waiting for you to come, she is happy and exited she has changed her hair color to make herself more attractive for you and she's blushed , she kisses you and you are just a dead body with no reaction.
She goes in a deep thought that what on earth has happened to you, she waits, she takes you home she opens the door, you get in you see the walls, you close your eyes, you rush in to your room and close the door. You cry with your heart for her tender, you feel so guilty but you also feel joy at the same time, you've already missed the one and you can not look in the girl’s eyes, she opens the door, she comes to you, she put her hands on your shoulder, you don’t move, you say softly: I’m sorry, but I need sometimes lone by myself, please leave me alone. I am in such a painful mess, she cries she expected some thing else, she is there to be kissed, she is the to make love to you, she is there to hear how much you have missed her, but you cannot even touch her face, you are loyal to your love and you cannot touch anybody just your love. You are wondering: back then I used to play and act very well now, why can’t I even pretend. You answer to yourself: because back then there was not such person whom you really feel love for. You have changed, yes just in 10 days you have changed 1000 times.
She cries , she says to you I will come back tomorrow, I am sure tomorrow you will feel alright, it is just jet lack or a cold or a massive tiresome.
She says :see you tomorrow and she leaves.

your massive happiness has caused her a massive misery. what should be done?