1. Time and space distance: In college, girlfriends may be in the same city or in nearby cities, so they have more time and opportunities to be together. But after graduation, people may go to different cities and have different jobs and lives, so the frequency and opportunities of contact will be reduced.

2. Changes in life stages: After graduation, everyone may face new life and professional pressures, and their focus has changed. It may take time to adapt to the new environment and start a new stage of life, so the demand and interest in social activities may decrease.

3. Personal development differences: Everyone's career and life plan are different, and they may choose different paths after graduation. This may lead to fewer people sharing the same topic and less contact.

4. Dynamic interpersonal relationships: interpersonal relationships are dynamic, and with the passage of time, everyone's preferences, interests and lifestyles may change. Maybe everyone no longer has the same interests and there are not so many topics to share.

5. Psychological and emotional adjustment: You may face some emotional and psychological adjustment after graduation. For example, living independently, dealing with new pressures and so on. , may lead to a reduction in the demand for social activities for a period of time.

Although these are all possible reasons, the specific situation may vary from person to person. If you want to keep in touch with your girlfriends, you can take the initiative to contact them, share your life and feelings, or invite them to do things you like together. This will bring your closer together.