There could be a variety of reasons for not being able to keep friends at every stage, and here are some possible explanations:
1.Changes in common interests and values: People's interests and values can change over time. If you and your friend share common interests and values at a certain stage but change at a later stage, it may lead to less connection or estrangement between you.
2.Geographical distance and life changes: People's lives are often influenced by geographical location and life stage. When you and your friends live in different places or enter a new stage of life (e.g., college, work, marriage, etc.), it can lead to less contact between you, making it difficult to maintain a close friendship.
3.Expansion of social circles: As people get older and have more experiences, they tend to meet more people and expand their social circles. This can cause your attention and energy to be distracted, making it difficult to focus on maintaining friendships at each stage.
4.Lack of communication and commitment: Maintaining a friendship requires effort and communication from both parties. If you don't have enough time, energy, or interest to maintain a friendship at a certain stage, it can lead to a relationship estrangement.
5.Changes in interpersonal relationships: Interpersonal relationships are mutually influencing and changing. The connection between you and your friends is influenced by external factors such as work pressure, family problems, life turning points, etc. These factors can lead to a change in friendship or distancing.
To stay in touch with your friends, it is advisable to make an effort to communicate and engage and pay attention to each other's lives and needs. It is also important to understand and accept changes in relationships, and sometimes friendship estrangement is natural and not necessarily your personal problem. Remember to respect each other's choices and spaces, while also giving yourself time and energy to nurture new friendships.