The human mind is complex, and everyone reacts differently to different situations.
If you were happy that you and your true love are over, there are many reasons that exist, and not all of them mean you're not truly in love.
Think to yourself some of these reasons, and ask yourself if any hold true:
Perhaps you have no confidence that you and her will ever actually be together; you've thought to yourself long and hard that you've put yourself in a shell for this girl for a long time..has she been the same? Have you, kilometers upon kilometers away, been holding her back from what could be going on in her life?
Or perhaps, on the same track, you are starting to feel she deserves better? Seeing you for one month every few months at maximum is not what she deserves, but better?
Maybe you just want some time to yourself; there's a time for love and a time for alone time -- everyone has felt this, even people DEEP in love. Suffocation in a relationship is almost worse than being without your love.
And negatively thinking..maybe just a glimmer in your mind wanted it to be over; you love her, but you are tired of long distance relationships, and you're tired of waiting for the time to come for you to be together forever. Now that it's over, you have a while of rejoice, though it often follows by regret, and often comes with confusion; you want her back, you love her, you just don't want to have a long distance relationship.