I think the first reason may be that the social circle is too small, and there is little contact time with the opposite sex in college, so I may not know how to get along with the opposite sex. In addition, the chances of finding someone are even smaller. If you really want to find someone, I think you can go out and make more friends, don't close yourself up, get along with more friends, and there will always be someone suitable for you.
I think another reason is personality. Some girls get along well with friends and have a good popularity, but they don't know how to get along with the opposite sex and what to do when they have a boyfriend, so they have separated before they get through the running-in period. They still think it is much easier to get along with friends than to fall in love, so they have no idea of finding a partner.
Another reason may be that the requirements are too high, because love on campus should be pure and beautiful, so there is no need to worry so much, but there will always be people putting pressure on each other, such as comparing. Some girls will let their boyfriends buy gifts on holidays or birthdays, and let her show off in the circle of friends, but in fact, the boy's own conditions are not good, so it is difficult to satisfy her. Such a girl just can't understand her boyfriend. Selfish.