The reason you still can’t stop loving that person although you know that you can’t have him is that your subconscious mind didn’t fully accept what happened. Acceptance can only happen when the subconscious mind makes sure that the event is irreversible. Most people who want to stop loving someone prevent themselves from accepting the fact that they can’t have him by doing the following:

1-Visualizing the good old memories
2-Keeping all the things that reminds them of him (text messages, e-mails.. etc)
3-Never confront the person directly and so keep the door open for hope

All of these practices keep hope present and so prevent acceptance. If you want to stop loving that person you should first accept what happened by confronting him and making sure that he has no intentions to restore the relationship.

The second thing you should do is deleting the mails, the text messages and removing everything that reminds you of him. The last thing is holding yourself from thinking about him, I know that sometimes thoughts flow involuntary, but at least you can prevent these involuntary thoughts from growing bigger. All of these actions still convince your subconscious mind that its over and so you will be able to stop loving him.

One of the things that prevent you from stopping to love someone is thinking that this person is the one. If you think that way then ask yourself a question, is there anybody else on earth who is better than him? Its either there is someone you know or either there is someone you haven’t met yet, but definitely, he is the not the best person in the world, else everyone would have loved him. Instead of feeling sad or down promise yourself that you will find someone better than him. This will help you get rid of the false idea that he is the best person in the world and so it will help you to stop loving him.

One of the strongest ways to convince your subconscious mind to believe in something is repetition. The more you repeat the fact that its over the more is this statement likely to turn into a belief.

If you want to stop loving someone then prevent yourself from repeating these phrases or from even thinking about them:

I can’t live without him
I can’t stop loving him
He is the only one I loved that much

Do not supress your thoughts but change the way you think about it.........You can recover and find love yourself again.

I've learned that no matter what happens, or how bad it seems today, life does go on, and it will be better tomorrow. I've learned that 
you can tell a lot about a person by the way he/she handles these three things: a rainy day, lost luggage, and tangled Christmas tree lights.

I've learned that regardless of your relationship with your parents, you'll miss them when they're gone from your life. I've learned that making a living is not the same thing as making a life. I've learned that life sometimes gives you a second chance. 

I've learned that you shouldn't go through life with a catcher's mitt on both hands; you need to be able to throw some things back. I've learned that whenever I decide something with an open heart, I usually make the right decision.

I've learned that even when I have pains, I don't have to be one. I've learned that every day you should reach out and touch someone. People love a warm hug, or just a friendly pat on the back. I've learned that I still have a lot to learn. 

I've learned that people will forget what you said, people will forget what you did, but people will never forget how you made them feel.”