When a person follows someone and keeps seeing their pictures over and over they might get obsessed with them, and as a result, relationship problems might happen.
According to psychologists, the more familiar we become with people, the more likely we are to find them attractive. As a person follows someone and keeps seeing their pictures, they might end up liking them. See why we like familiarity.
According to studies, getting exposed to celebrity pictures can make one's relationship partner seem much less attractive. As this becomes a habit through Instagram, a person might become less attracted to their relationship partner. See also why Instagram is bad for you.
The use of Instagram can promote jealousy and cause tensions in relationships. A person might get jealous when their relationship partner follows someone and keeps liking their pictures.
Instagram can easily allow a person to interact with a stranger, send them private messages and develop a relationship with them. Unlike Facebook where a person can only contact the ones they know, Instagram can make talking to strangers easier. See also why Instagram is fake.
According to a study, posting more selfies on Instagram can lead to relationship problems. As the person broadcasts their body image to others, certain relationship tensions might arise. See also why do people take selfies.
Comments and likes on pictures of strangers can cause relationship tensions. As one partner might start questioning the behavior of another on Instagram, problems might arise.
When a person uses Instagram often they might expose their private lives to complete strangers. Those strangers might then interact in a way that threatens the relationship.
When a person doesn't post a photo of their relationship partner on Instagram, problems might arrive. The one whose pictures wasn't posted might question the intentions of their partner and so tensions might happen.
If a person has many interactions with strangers, they are very likely to become more protective of their phones. This could lead to problems and tensions in a relationship. See why Instagram is popular.
If a person felt they have lots of fans, they might not be very keen on keeping their current relationship. This person might believe that they can find a better partner easily and so the relationship might become unstable.