How to get out of a relationship?

I have been dating a girl since 7 months.
Actually she proposed me, that time i had no reason to say No and no harms to say Yes... i told her about this , and she asked me for a chance, so i did. I gave my best in this relationship. I was loyal to her.
Now i don't want to be in this relationship, don't know why. I don't like her anymore the way i like her before. I am not interested in her anymore. I want to get out of this relationship, but i also dont want her to be hurt. She is very understanding, she will easily allow me to go.. but she is very much emotional... she will cry a lot and i fear she might go in depression.
Pls help me make it smooth.
How to get out of a relationship?
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