I think there are 5 reasons why relationships end. . -Lack of intimacy. If someone is in a long distance relationship then they will crave physical contact with the one they love. For some, this becomes not enough . -Lack of emotional connection. If a couple don't understand each other then theres a lack of engaging conversation and most importantly lack of trust and respect -Change of personality. If a person changes for better or worse, the significant other might not like the change and see them differently . -someone else. Obviously if someone is interested in someone who's not there partner its going to affect things . -Lies. This links to emotional connection but obviously once a liar is caught, its hard to trust them again