Is long distance relationships last?

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A lot of my batch-mates in college that were committed to one another were ruined after we graduated. They were departed due to pursuing our own interest. When I started working one of my officemate got another boyfriend while she had not broke up yet with her boyfriend from her province. I noticed nowadays that a couples that are not together were shattered because of the third party. From this affirmation, do you believe that there are still long distance relationship exist?