You fell in love with an idea.
Ok, this is not always the case. Really depends.
However, in many cases of bad breakups you have fallen for an idea.
The person you loved suddenly changed and things gotten bad and you've broken up. Now you feel all hurt losing such a once great love.
Don't feel hurt over it. Instead, consider that it's more than likely that the relationship has been a lie. You fell in love with the idea you had of that person, he/she might have reinforced that idea by acting as a person they aren't really. Otherwise you might have been blind to the truth of that person all along.
Both come down to them not being what you thought it was.
So, this love you lost, was never your love at all. You didn't fell in love with that person, you didn't love that person. You fell for an idea, similar to a celeb crush. You needed the attention or liked the appearance of that person and fabricated the rest around it.
Once you realize that as the truth, it will be much much easier to get over your ex and move on.