I really need help from you all who have truly loved someone ever . I am an Indian guy living in Germany from past 2-3 years. I love a spanish girl studying with me. We both are very very good friends but the problem is, she got boyfriend just some days before I actually met her for the first time. I know she also likes me a lot as she tells me everything about her and asks me to give her an advise before she do anything. She stays with me more than her boyfriend. She tells me every time that there is nothing as such serious and she has no intention to settle in Germany with him. She considers me her best friend and so do I. Her boyfriend is really a nice person (I met him once) and helps her a lot.
I completely understand that she is not available for me now and I have no right to love her, but my heart doesn't understand this thing. I tried ignoring her as well, but the far I go, the closer she comes. I am so heart broken that I planned to go far away from here without telling anyone :(

2-3 years is a long time to wait for someone. I think it's time for you to put your foot down, make a decision and move on.

Try reading this thread to better understand the decisions I'm talking about: https://www.askmehelpdesk.com/dating/guidlines-what-do-do-if-person-like-already-relationship-463250.html

Sorry for the confusion. I am just living here from past 2-3 years, I am with her from past 4 months only.

You should still read the thread I provided.

As for trying to ignore her. If you gave up trying to ignore her, then it's like you never ignored her in the first place. Once you restart talking to her, then all the progress you made gets reset.

If you're willing to drag this out and wait it out, then that's your choice. In that case, just be patient. Wait and see what happens.

But if you want to move on with your life, then make a decision and stick with it. If you tell her how you feel, then leave the ball on her side of the court and let her decide what to do next. If you don't want to tell her anything, then you're better of cutting her out of your life until your feelings for her have completely gone away.